{"id":2816,"date":"2015-07-07T10:02:24","date_gmt":"2015-07-07T15:02:24","guid":{"rendered":"https:\/\/uwm.edu\/physics\/?post_type=tribe_events&#038;p=2816"},"modified":"2023-02-07T10:13:07","modified_gmt":"2023-02-07T16:13:07","slug":"colloquium-shivani-rajput","status":"publish","type":"tribe_events","link":"https:\/\/uwm.edu\/physics\/event\/colloquium-shivani-rajput\/","title":{"rendered":"Colloquium: Shivani Rajput"},"content":{"rendered":"<p>This special Physics department colloquium is scheduled for Thursday 7\/9\/15 at 3:00 pm in in the Kenwood Interdisciplinary Research Complex (KIRC) Room KEN 1140.  Tea, coffee, and cookies will be available in KEN 3118 (third floor kitchenette located next to the elevators) at 2:30 PM.  Anyone is welcome.<\/p>\n<p><strong>Tunneling Experiments with Dirac Electrons in Graphene Heterojunctions<\/strong><br \/>\n<strong>Shivani Rajput<\/strong>, PhD Candidate\/UWM Dept. of Physics<\/p>\n<p>Sparked by the isolation of graphene in 2004, recent research has uncovered a new class of materials with their low-energy excitations behaving a massless Dirac particles rather than fermions obeying the canonical Schr\u00f6dinger equation.  In this talk, using graphene as an example, I will first briefly give a sense of why Dirac materials have generated such excitement in condensed matter physics.  I will then present my research on the understanding of graphene heterojunctions at the atomic scale using scanning tunneling microscopy\/spectroscopy.  In the first case, I will show how charge carriers in graphene can be controlled by substrate polarization in graphene-SiC heterojunctions.  In the 2nd case, I will present the atomic resolution imaging of graphene ripples and other intrinsic spatial inhomogeneities that affect the Schottky barrier at graphene-semiconductor junctions.  Lastly, I will show the transfer of giant spin-orbit coupling in graphene through proximity to a three-dimensional-topological insulator Bi2Se3, making possible the observation of the quantum spin Hall effect at room temperature.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This special Physics department colloquium is scheduled for Thursday 7\/9\/15 at 3:00 pm in in the Kenwood Interdisciplinary Research Complex (KIRC) Room KEN 1140. 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