BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Physics & Astronomy - ECPv6.16.3//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:Physics & Astronomy X-ORIGINAL-URL:https://uwm.edu/physics X-WR-CALDESC:Events for Physics & Astronomy REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:America/Chicago BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 TZNAME:CDT DTSTART:20140309T080000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 TZNAME:CST DTSTART:20141102T070000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 TZNAME:CDT DTSTART:20150308T080000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 TZNAME:CST DTSTART:20151101T070000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 TZNAME:CDT DTSTART:20160313T080000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 TZNAME:CST DTSTART:20161106T070000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 TZNAME:CDT DTSTART:20170312T080000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 TZNAME:CST DTSTART:20171105T070000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 TZNAME:CDT DTSTART:20180311T080000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 TZNAME:CST DTSTART:20181104T070000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 TZNAME:CDT DTSTART:20190310T080000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 TZNAME:CST DTSTART:20191103T070000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 TZNAME:CDT DTSTART:20200308T080000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 TZNAME:CST DTSTART:20201101T070000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 TZNAME:CDT DTSTART:20210314T080000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 TZNAME:CST DTSTART:20211107T070000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 TZNAME:CDT DTSTART:20220313T080000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 TZNAME:CST DTSTART:20221106T070000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 TZNAME:CDT DTSTART:20230312T080000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 TZNAME:CST DTSTART:20231105T070000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 TZNAME:CDT DTSTART:20240310T080000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 TZNAME:CST DTSTART:20241103T070000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 TZNAME:CDT DTSTART:20250309T080000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 TZNAME:CST DTSTART:20251102T070000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240503T153000 DTEND;TZID=America/Chicago:20240503T170000 DTSTAMP:20260610T183118 CREATED:20240301T171200Z LAST-MODIFIED:20240423T152504Z UID:10435336-1714750200-1714755600@uwm.edu SUMMARY:Physics Colloquium - Segev BenZvi DESCRIPTION:Segev BenZvi\, Assoc. Professor\, Department of Physics\, University of Rochester \nMeasuring Cosmic Expansion with the Dark Energy Spectroscopic Instrument \nSince the first observations of the accelerating expansion of the universe at the end of the 1990s\, astronomers and physicists have struggled to understand dark energy\, a mysterious repulsive force that drives the acceleration. A number of models of dark energy exist. The simplest (the cosmological constant)\, assumes dark energy is non-interacting and is the same everywhere in space and time. Different models predict subtely different features in the large-scale structure of the universe. We are now entering an era of new photometric and spectroscopic surveys which can discriminate different models of dark energy with unprecedented precision. \nIn this talk\, I will present the latest results from the Dark Energy Spectroscopic Instrument (DESI)\, a fiber-fed\, robotically-actuated galaxy redshift survey that has been in operation at Kitt Peak National Observatory since mid-2021. In April 2024\, the DESI Collaboration released its results from the first year of data taking. I will describe the performance of DESI\, summarize the first year of data and our cosmological analyses\, and present prospects for future results. \nThe event flyer is available here. URL:https://uwm.edu/physics/event/physics-colloquium-segev-benzvi/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240426T153000 DTEND;TZID=America/Chicago:20240426T170000 DTSTAMP:20260610T183118 CREATED:20240301T171028Z LAST-MODIFIED:20240426T125548Z UID:10435335-1714145400-1714150800@uwm.edu SUMMARY:Physics Colloquium - Rob Pisarski DESCRIPTION:Rob Pisarski\, Distinguished Scientist\, Department of Physics\, Brookhaven National Laboratory \nThe Ugly Duckling and the Swan: The Quark-Gluon Plasma and Heavy Ion Collision \nI give a pedagogical and historical overview of the search for the Quark-Gluon plasma (QGP) in the collisions of heavy ions. I begin with a brief review of why we expect a QGP to be formed at high temperature. In this\, numerical simulations in lattice Quantum ChromoDynamics (QCD) form the bedrock of the field. In particular\, they demonstrate the relationship between deconfinement and the restoration of chiral symmetry. \nAt the SPS at CERN\, I discuss the suppression of J/Psi mesons\, and the excess of dileptons below the rho meson. Bjorken first noticed that a “plateau” may emerge at high energies\, and produce a regime at high temperature\, and low chemical potential. At colliders such as RHIC\, at Brookhaven\, and the LHC\, at CERN\, I discuss two notable signals: the utility of nearly ideal hydrodynamics\, and jet quenching. The new frontier is going down to moderate collision energies\, which there is net excess of baryons. Possible phenomena in this region include a critical end point and moat regimes. \nThe event flyer is available here. URL:https://uwm.edu/physics/event/physics-colloquium-rob-pisarski/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240419T153000 DTEND;TZID=America/Chicago:20240419T170000 DTSTAMP:20260610T183118 CREATED:20240301T170912Z LAST-MODIFIED:20240412T134014Z UID:10435334-1713540600-1713546000@uwm.edu SUMMARY:Physics Colloquium - Joel Nowitzke DESCRIPTION:Joel Nowitzke\, PhD Candidate\, UW-Milwaukee \nModeling and Measurements of Network Formation and Viscoelastic Behavior of Folded Protein-Based Hydrogels \nProteins are vital for various daily functions and are even used in creating biocompatible materials through chemical crosslinking. However\, predicting the mechanical properties of these materials is challenging due to the random orientation of constituent molecules within the network. Bridging the gap between nanoscopic and macroscopic scales is essential for formulating predictable biomaterials. Through a combination of experimental methods and computational simulations\, including Single Molecule Magnetic Tweezers and Steered Molecular Dynamics Simulations\, we aim to understand these properties. This approach involves determining the relative stability of pulling geometries and simulating protein unfolding to create accurate models. By subjecting simulated networks to external stress\, we assess their behavior compared to experimental data\, ensuring realistic predictions. \nThe event flyer is available for download here. URL:https://uwm.edu/physics/event/physics-colloquium-joel-nowitzke/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240405T153000 DTEND;TZID=America/Chicago:20240405T170000 DTSTAMP:20260610T183118 CREATED:20240301T170802Z LAST-MODIFIED:20240312T171812Z UID:10435333-1712331000-1712336400@uwm.edu SUMMARY:Physics Colloquium - Marcus Noack DESCRIPTION:Dr. Marcus Noack\, Research Scientist\, Lawrence Berkeley National Lab \nNext-Generation Gaussian Processes for Function Approximation\, Uncertainty Quantification\, and Decision-Making \nGaussian processes (GPs) and Gaussian-related stochastic processes are powerful tools for function approximation\, uncertainty quantification\, global optimization\, and autonomous data acquisition due to their robustness\, analytical tractability\, and natural inclusion of Bayesian uncertainty estimates. Even so\, Gaussian processes are often criticized for poor approximation performance and neck-breaking computational costs in real-life applications. The reason for this gap\, however\, is not the methodology itself but rather a user-caused lack of flexibility and domain awareness of the underlying prior probability distribution. \nIn this talk\, I address many challenges of GPs that might inhibit optimal performance. We will discover hands-on solutions and tools that make implementation easy. The key takeaway for the audience will be a better understanding of Gaussian processes and ways to customize them for optimal performance. \nThe event flyer is available here. URL:https://uwm.edu/physics/event/physics-colloquium-marcus-noack/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240329T153000 DTEND;TZID=America/Chicago:20240329T170000 DTSTAMP:20260610T183118 CREATED:20240311T212140Z LAST-MODIFIED:20240311T212140Z UID:10435337-1711726200-1711731600@uwm.edu SUMMARY:Physics Colloquium - Gabor Csathy DESCRIPTION:Professor Gabor Csathy\, Department of Physics and Astronomy\, Purdue University \nEmergent Particles and Topology in Flat Landau Bands \nElectronic systems with flat energy bands support a variety of topological phases of current interest. The two-dimensional electron gas in the fractional quantum Hall regime is such a system. Ground states of this system found an elegant description in terms of emergent particles called composite fermions. \nIn this talk we review the topological ground states and some of their basic properties and discuss two recent discoveries: fractional quantum Hall states associated with flux-six composite fermions and a bubble phase of composite fermions. \nThe event flyer is available here. URL:https://uwm.edu/physics/event/physics-colloquium-gabor-csathy/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240301T153000 DTEND;TZID=America/Chicago:20240301T163000 DTSTAMP:20260610T183118 CREATED:20240220T150216Z LAST-MODIFIED:20240220T150216Z UID:10435331-1709307000-1709310600@uwm.edu SUMMARY:Physics Colloquium - Sarah Vigeland DESCRIPTION:Searching for a Gravitational Wave Background with Pulsar Timing Arrays \nSarah Vigeland\, Asst. Professor\, Dept. of Physics\, UW-Milwaukee\nPulsar timing arrays use observations of millisecond pulsars to detect nanohertz gravitational waves. The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) Collaboration has recently released their 15-year data set containing observations of 68 millisecond pulsars. These data contain evidence for Hellings-Downs correlations\, which are characteristic of a gravitational wave background. \nIn this talk\, I will present these results\, and discuss the spectral properties of the signal and implications for the astrophysical source. I will also discuss prospects for detecting other types of gravitational wave sources with pulsar timing arrays\, including individual supermassive binary black holes. \nThe event flyer is available here. URL:https://uwm.edu/physics/event/physics-colloquium-sarah-vigeland/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240223T153000 DTEND;TZID=America/Chicago:20240223T170000 DTSTAMP:20260610T183118 CREATED:20240208T135341Z LAST-MODIFIED:20240220T150248Z UID:10435330-1708702200-1708707600@uwm.edu SUMMARY:Physics Colloquium - Helvi Witek DESCRIPTION:CSI Gravity: Investigating Mysteries of Fundamental Physics with Black Holes \nDr. Helvi Witek\, Asst. Professor\, Dept. of Physics\, UIUC\nBlack holes are among the most exciting predictions of Einstein’s theory of general relativity\, composed of the fabric of spacetime itself. Observations of black holes offer unique access to extreme gravity\, and they enable us to investigate long-standing puzzles in fundamental physics ranging from dark matter to the very nature of gravity itself. \nIn my presentation\, I will first provide an overview of recent black hole observations\, including gravitational wave detections. I will then discuss how we produce theoretical models of black hole mergers and gravitational waves using numerical relativity\, that are needed to correctly interpret the observations. I will conclude with a taster on how we can use numerical relativity simulations to learn about the nature of gravity or new (axionlike) particles. \nThe event flyer is available here. URL:https://uwm.edu/physics/event/physics-colloquium-helvi-witek/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20231201T150000 DTEND;TZID=America/Chicago:20231201T170000 DTSTAMP:20260610T183118 CREATED:20231101T202803Z LAST-MODIFIED:20231130T211039Z UID:10435329-1701442800-1701450000@uwm.edu SUMMARY:Physics Colloquium - Francis Halzen DESCRIPTION:IceCube: Opening a Neutrino Window on the Universe from the South Pole \nProfessor Francis Halzen\, Professor and Director of IceCube\, Department of Physics\, University of Wisconsin-Madison \nBelow the geographic South Pole\, the IceCube project has transformed one cubic kilometer of natural Antarctic ice into a neutrino detector. IceCube detects more than 100\,000 neutrinos per year in the GeV to 10 PeV energy range. From those\, we have isolated a flux of high-energy neutrinos originating beyond our Galaxy\, with an energy flux that is comparable to that of the extragalactic high-energy photon flux observed by the NASA Fermi satellite. With a decade of data\, we have identified their first sources\, which point to the obscured dense cores associated with the supermassive black holes of some active galaxies as the origin of high-energy neutrinos (and cosmic rays!). \nThe event flyer is available here. URL:https://uwm.edu/physics/event/physics-colloquium-professor-francis-halzen/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20231117T150000 DTEND;TZID=America/Chicago:20231117T170000 DTSTAMP:20260610T183118 CREATED:20231101T202535Z LAST-MODIFIED:20231101T202535Z UID:10435328-1700233200-1700240400@uwm.edu SUMMARY:Physics Colloquium - Roshanak Etemadpour DESCRIPTION:Roshanak Etemadpour\, Ph. D. candidate\, Department of Physics\, University of Wisconsin-Milwaukee \nThe title and abstract for this talk will be posted when made available. URL:https://uwm.edu/physics/event/physics-colloquium-roshanak-etemadpour/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20231110T153000 DTEND;TZID=America/Chicago:20231110T163000 DTSTAMP:20260610T183118 CREATED:20231101T202041Z LAST-MODIFIED:20231103T205221Z UID:10435327-1699630200-1699633800@uwm.edu SUMMARY:Physics Colloquium - Min Gyu Kim DESCRIPTION:Assistant Professor Min Gyu Kim\, UWM Department of Physics \nHow to See Antiferromagnetic Domains and Domain Walls \nIn this talk\, I will introduce myself and discuss my journey as an experimental condensed matter physicist\, explaining the field briefly. I will then focus on my recent research activities and interests\, specifically on imaging antiferromagnetic domains and domain walls. \nMagnetic domains play a fundamental role in the physics of magnetism\, and their manipulation can be achieved through domain wall (DW) propagation. The discovery of electric-field-driven switching of antiferromagnetic (AFM) spin arrangement has reignited interest in the field of spintronics using antiferromagnets. Despite the potential of antiferromagnetic materials for use in future electronic devices\, the dynamics of antiferromagnetic domain walls are poorly understood due in large part to the lack of techniques for visualizing AFM DWs. In this presentation\, I will introduce a recently developed coherent X-ray imaging technique\, a diffraction-based full-field imaging method that produces real-time\, direct space images. With this technique\, we can study fluctuating micrometer-scale antiferromagnetic domains on timescales from 10-2 to 103 sec.\, with the potential to improve the resolution to ~ 10-11 sec. in the future. \nThe event flyer can be downloaded here. URL:https://uwm.edu/physics/event/physics-colloquium-min-gyu-kim/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20230317T153000 DTEND;TZID=America/Chicago:20230317T163000 DTSTAMP:20260610T183118 CREATED:20230127T204607Z LAST-MODIFIED:20230207T154836Z UID:10435317-1679067000-1679070600@uwm.edu SUMMARY:Physics Colloquium - Pierre-Alexandre Gourdain DESCRIPTION:Pierre-Alexandre Gourdain\, University of Rochester \nThe Impact of Electron Physics in High Energy Density Plasmas \nThe study of high energy density plasmas (HEDP) allows researchers to study the impact of microscopic phenomena on macroscopic scales by using plasmas dense enough to be probed by high energy photons (i.e. visible\, UV\, X-ray). This probe allows us to use readily available detectors to make precise\, two-dimensional measurements of the electron density and infer the electron flow speed and magnetic field. \nIn this talk\, I will highlight how electron physics can shed some light on how long-range interactions can create macroscopic behavior\, such as collision-less shocks and particle acceleration\, but also how it can be used to test statistical integral operators that can capture more exotic phenomena than simple hard-sphere collisions\, which yield Gaussian distributions. \nThe event flyer may be downloaded here URL:https://uwm.edu/physics/event/physics-colloquium-pierre-alexandre-gourdain/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20230310T153000 DTEND;TZID=America/Chicago:20230310T163000 DTSTAMP:20260610T183118 CREATED:20230127T204433Z LAST-MODIFIED:20230227T173154Z UID:10435316-1678462200-1678465800@uwm.edu SUMMARY:Physics Colloquium - Daniel Vrinceanu DESCRIPTION:Daniel Vrinceanu\, Texas Southern University \nRadiative Cascade in Rydberg Atoms \nThis talk is an introduction to the physics of Rydberg atoms. The two complementary flavors of Rydberg atoms\, high and low angular momentum states\, have contrasting properties as they relate to the correspondence principle that bridges classical behavior to quantum mechanics. Dynamic symmetries allow a unified point of view to investigate this correspondence. Highly excited atoms dissipate their energy in different ways depending on their initial angular momentum: low angular momentum states make transitions in large energy increments\, quickly approaching the ground state\, while high angular momentum states make small steps\, slowly spiraling towards lower states. \nThe event flyer may be downloaded here. URL:https://uwm.edu/physics/event/physics-colloquium-daniel-vrinceanu/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20211029T140000 DTEND;TZID=America/Chicago:20211029T153000 DTSTAMP:20260610T183118 CREATED:20200303T174247Z LAST-MODIFIED:20211015T151452Z UID:10390516-1635516000-1635521400@uwm.edu SUMMARY:Physics Colloquium - Mark Williamsen DESCRIPTION:Mark Williamsen\, Quantum Design\, Inc \nApplications of AC Bridges in Cryogenic Measurements \nAC (alternating current) bridges have proven to be useful in making precise measurements at low temperature\, including thermometry as well as length change with respect to either thermal expansion (dilatometry) or applied magnetic field (magnetostriction). Techniques now in use allow one leg of the bridge to be placed at the cryogenic sample site while the other legs remain at room temperature\, with the intervening temperature gradient being imposed along a length of coaxial cable. Using this method\, length change measurements at atomic scale have recently been used to study a hidden order phase in the heavy fermion system URu2Si2. Plans are now underway to apply this sensitive measurement to a variety of single crystal and polycrystalline samples. \nRelevant citing: S. Ran\, G. M. Schmiedeshoff\, N. Pouse\, I. Jeon\, N. P. Butch\, R. B. Adhikari\, C. C. Almasan & M. B. Maple; “Rapid suppression of the energy gap and the possibility of a gapless hidden order state in URu2−xRexSi2\,” Philosophical Magazine\, 99:14\, 1751-1762\, DOI: 10.1080/14786435.2019.1600756 (2019). \nThe event flyer is available here. URL:https://uwm.edu/physics/event/physics-colloquium-mark-williamsen/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20210924T150000 DTEND;TZID=America/Chicago:20210924T160000 DTSTAMP:20260610T183118 CREATED:20210921T184718Z LAST-MODIFIED:20210921T190112Z UID:10390518-1632495600-1632499200@uwm.edu SUMMARY:Physics Colloquium - Dr. Morgan Lynch DESCRIPTION:Dr. Morgan Lynch \nA Brief History of Quantum Field Theory in Curved Spacetime \nThe incorporation of classical general relativity into the framework of quantum field theory yielded a rather surprising result — thermodynamic particle production. In short\, for fundamental deformations in the structure of spacetime\, quantum mechanics necessitates the creation of thermalized particles from the vacuum. One such phenomenon\, known as the Unruh effect\, causes empty space to effervesce a thermal bath of particles when viewed by an observer undergoing uniformly accelerated motion. \nIn this presentation\, we will review the timeline of conceptual discoveries which led to broad classes of these intriguing thermodynamic phenomena. Beginning with the original discovery of particles created by the expansion of the universe\, we will cover a brief history of quantum field theory in curved spacetime\, culminating in the first experimental observation of the Unruh effect\, and other aspects of acceleration-induced thermality\, in high energy channeling radiation. \nEvent flyer is available here URL:https://uwm.edu/physics/event/physics-colloquium-dr-morgan-lynch/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20191024T143000 DTEND;TZID=America/Chicago:20191024T153000 DTSTAMP:20260610T183118 CREATED:20190827T143820Z LAST-MODIFIED:20191016T171808Z UID:10384502-1571927400-1571931000@uwm.edu SUMMARY:IEEE/Physics Colloquium - Professor Hari Srikanth DESCRIPTION:Professor Hari Srikanth\, Dept. of Physics – Univ. of South Florida & 2019 IEEE Magnetic Society Distinguished Lecturer \nTuning Magnetic Anisotropy in Nanostructures for Biomedical Applications \nMagnetic nanoparticles have been building blocks in applications ranging from high density recording to spintronics and nanomedicine. Magnetic anisotropies in nanoparticles arising from surfaces\, shapes and interfaces in hybrid structures are important in determining the functional response in various applications. In this talk\, I will first introduce the basic aspects of anisotropy\, how to tune it in nanostructures and ways to measure it. I will discuss resonant RF transverse susceptibility\, that we have used extensively\, as a powerful method to probe the effective anisotropy in magnetic materials. Tuning anisotropy has a direct impact on the performance of functional magnetic nanoparticles in biomedical applications such as contrast enhancement in MRI and magnetic hyperthermia cancer therapy. There is a need to improve the specific absorption rate (SAR) or heating efficiency of nanoparticles for hyperthermia and I will focus on the role of tuning surface and interfacial anisotropy with a goal to enhance SAR. Strategies going beyond simple spherical structures such as exchange coupled core-shell nanoparticles\, nanowire\, nanotube geometries can be exploited to increase saturation magnetization\, effective anisotropy and heating efficiency in magnetic hyperthermia. This lecture will combine insights into fundamental physics of magnetic nanostructures along with recent research advances in their application in nanomedicine. \nEvent flyer available here URL:https://uwm.edu/physics/event/physics-colloquium-hari-srikanth/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20170119T153000 DTEND;TZID=America/Chicago:20170119T163000 DTSTAMP:20260610T183118 CREATED:20170112T192725Z LAST-MODIFIED:20170112T193157Z UID:10375394-1484839800-1484843400@uwm.edu SUMMARY:Physics Colloquium: Dr. Katia Grenier DESCRIPTION:Miniaturized Microwave & Millimeter Wave Biodetection for Molecular and Cellular Characterization\nDr. Katia Grenier\, LAAS – CNRS (Toulouse\, France) \n \nAbstract: Microwave and millimeter wave dielectric spectroscopy is a powerful technique for non-ionizing and non-destructive material characterization. Therefore\, its development for the analysis of the living at the molecular and cellular levels is very attractive for biological researches and biomedical applications\, where non-invasivity\, label-free and contact-less abilities as well as in-liquid measurements constitute important leitmotivs. \nThis talk will consequently present miniature biosensors and associated techniques\, which have been developed to characterize different biological materials in aqueous solution. Issues in terms of broadband and narrow band measurements\, sensitivity\, specificity and repeatability of measurements with standard deviations will notably be highlighted on different biomaterials\, such as carbohydrates and amino acids for biomolecules\, as well as human cells in suspension and at the single cell level. \nCoffee/cookies served just after 3:00 PM in the KIRC 3rd floor kitchen area URL:https://uwm.edu/physics/event/physics-colloquium-dr-katia-grenier/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20160720T133000 DTEND;TZID=America/Chicago:20160720T143000 DTSTAMP:20260610T183118 CREATED:20160717T203228Z LAST-MODIFIED:20160717T203932Z UID:10378409-1469021400-1469025000@uwm.edu SUMMARY:Colloquium: Dushyant Tomer DESCRIPTION:This special Physics department colloquium is scheduled for Wednesday 7/20/16 at 1:30 PM in the Kenwood Interdisciplinary Research Complex (KIRC) Room KEN 1150. Coffee and cookies will be available in KEN 3118 (third floor kitchenette located next to the elevators) at 3:30 PM. Anyone is welcome. \nSpatial Inhomogeneous Barrier Heights at Graphene/Semiconductor Schottky Junctions\nDushyant Tomer\, PhD Candidate/UWM Dept. of Physics \nGraphene\, a semimetal with linear energy dispersion\, forms a Schottky junction when interfaced with a semiconductor. This dissertation presents temperature-dependent current-voltage and scanning tunneling microscopy/spectroscopy (STM/S) measurements performed on graphene Schottky junctions\, formed with both two- and three-dimensional (2D and 3D) semiconductors. \n To fabricate Schottky junctions\, we transfer chemical vapor deposited monolayer graphene onto Si- and C-face SiC\, Si\, GaAs and MoS2 semiconducting substrates using a polymer assisted chemical method. We observe three main types of intrinsic spatial inhomogeneities: graphene ripples\, ridges and semiconductor steps in STM imaging that can exist at graphene/semiconductor junctions. Tunneling spectroscopy measurements reveal fluctuations in the graphene Dirac point position\, which is directly related to the Schottky barrier height. We find a direct correlation of the Dirac point variation with the topographic undulations of graphene ripples at the graphene/SiC junction. However\, no such correlation is established at graphene/Si and Graphene/GaAs junctions and Dirac point variations are attributed to surface states and trapped charges at the interface. \n We perform temperature dependent current-voltage measurements to investigate the impact of topographic inhomogeneities on electrical properties of the Schottky junctions. Additionally\, we observe bias dependent current and barrier height in reverse bias regime also for all Schottky junctions. URL:https://uwm.edu/physics/event/colloquium-dushyant-tomer/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20160211T093000 DTEND;TZID=America/Chicago:20160211T103000 DTSTAMP:20260610T183118 CREATED:20160210T145725Z LAST-MODIFIED:20160210T150802Z UID:10375389-1455183000-1455186600@uwm.edu SUMMARY:CGCA Special Event: LIGO Collaboration Press Release DESCRIPTION:100 years after Einstein predicted the existence of gravitational waves\, the National Science Foundation gathers scientists from Caltech\, MIT and the LIGO Scientific Collaboration to update the scientific community on efforts to detect them. \nWe will have the broadcast of the press release at KIRC 1150 followed by a Q&A session with CGCA LIGO members. \nhttp://www.ligo.org/news/media-advisory.php URL:https://uwm.edu/physics/event/cgca-special-event-ligo-collaboration-pressrelease/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:CGCA Seminars X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20151123T153000 DTEND;TZID=America/Chicago:20151123T163000 DTSTAMP:20260610T183118 CREATED:20151120T192639Z LAST-MODIFIED:20151120T192814Z UID:10372382-1448292600-1448296200@uwm.edu SUMMARY:Colloquium: Jason Tenboer DESCRIPTION:This special Physics department colloquium is scheduled for Monday 11/23/15 at 3:30 PM in the Kenwood Interdisciplinary Research Complex (KIRC) Room KEN 1150. Coffee and cookies will be available in KEN 3118 (third floor kitchenette located next to the elevators) at 3:00 PM. Anyone is welcome. \nTime-Resolved\, Near Atomic Resolution Structural Studies at the Free Electron Laser\nJason Tenboer\, PhD Candidate/UWM Dept. of Physics \nTime-resolved serial femtosecond crystallography (TR-SFX) employs X-Ray free electron lasers (XFELs) to provide X-ray pulses of femtosecond (fs) duration with 1012 photons per pulse. For structure determination\, protein crystals on the micrometer length scale (microcrystals) are injected into the X-ray beam and the resulting diffraction patterns are recorded on fast-readout pixel detectors. Although these intense pulses deposit enough energy to ultimately destroy the protein\, the processes that lead to diffraction occur before the crystal is destroyed. This diffraction-before-destruction principle overcomes radiation damage since each diffraction image is obtained from a fresh crystal. Therefore\, reversible and non-reversible reactions may be studied in the same fashion. \n With an initial experiment performed at the Linac Coherent Light Source (LCLS) we demonstrated for the first time that near atomic resolution TR-SFX is possible using an XFEL. Continuing on this work\, we have now determined previously uncharacterized structures of the photoactive yellow protein photocycle. This fs time-resolved study demonstrates the full capability and vision of XFELs with respect to photoactive proteins. In addition to studying photo-initiated reactions\, XFELs offer the unique opportunity to explore irreversible enzymatic reactions by the mix-and-inject technique. In this method\, microcrystals are mixed with a substrate and the following reaction is probed by the fs X-ray pulses in a time-resolved fashion. One of the primary missions of an XFEL is to routinely record a complete time-series at atomic resolution and near physiological temperature of these non-reversible fast enzymatic reactions. This capability would catalyze the rapid advancement of structure-based drug designs. URL:https://uwm.edu/physics/event/colloquium-jason-tenboer/ LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Physics Colloquia X-TRIBE-STATUS: GEO:43.0754962;-87.8839451 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962 END:VEVENT END:VCALENDAR