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One-dimensional edge modes of three-dimensional topological insulators
时间: 2017年04月18日 15:00
地点: M830
报告人: Titus Neupert Prof. Dr.

University of Zurich

Abstract
I will discuss two instances of one-dimensional conducting edge channels that can appear on the boundary of three-dimensional topological crystalline insulators, one supported by an experimental observation and the second one being a theoretical prediction. For the first part, I will discuss channels that appear at step edges on the surface of (Pb,Sn)Se. These conducting channels can be understood as arising from a Berry curvature mismatch between Dirac surface states on either side of the step edge. Experimentally, they have been found to be remarkably robust against defects, magnetic fields and elevated temperature. Second, I will introduce the concept of higher-order three-dimensional topological insulators, which have gapped surfaces, but support topologically protected gapless states on their one-dimensional physical hinges.

About speaker:
since 2016: Assistant Professor at the Department of Physics at the University of Zürich, Switzerland
2013-2016: Postdoctoral Fellow, Princeton Center for Theoretical Science, Princeton University, USA
2010-2013: PhD studies at ETH Zurich, Switzerland supervised by Prof. Dr. Manfred Sigrist, ETH Zürich, and Dr. Christopher Mudry, Paul Scherrer Institut Villigen
2009-2010: Visting scientist at the Condensed Matter Theory Laboratory, RIKEN, Saitama, Japan
2007-2009: Master study of physics: University of Zurich, Zürich, Switzerland
2005-2007: Study of physics at Dresden University of Technology, Dresden, Germany

Host:Xi Dai(82648057)


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