Campuses:

Topological Insulators

Thursday, May 18, 2017 - 2:00pm - 2:40pm
Gian Graf (Eidgenössische TH Zürich-Hönggerberg)
Band insulators are characterized by the Fermi energy lying in spectral
gap. More generally, we consider situations where that energy lies
within the spectrum, though in an regime of localization. We discuss how
indices are defined and affected by that situation,
as well as the relation between edge and bulk. The discussion is
pedestrian and is based on examples in dimension 1 and 2 exhibiting
different symmetries.
Wednesday, November 2, 2016 - 2:00pm - 2:50pm
Miguel Bandres (Technion-Israel Institute of Technology)
Topological insulators are a phase of matter with an insulating bulk and conducting edges. A topological insulator is characterized by a bulk bandgap where topological gapless unidirectional edge states reside. These edge states are robust to any perturbation that does not close the bandgap. In this way, deformations of the system like disorder, strain, or imperfections have little effect on the transport of such topological edge modes.
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