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Condensed Matter Colloquium Thursday, February 9, 2012

Summary: Condensed Matter Colloquium
Thursday, February 9, 2012
2 pm, Room 1201
Refreshments at 1:30 pm in Room 1305F
Doron Bergman
California Institute of Technology
The topological insulator in a Fermi sea - sink or swim?
In the flurry of experiments looking for topological insulator materials,
it has been found that some bulk metals very close to topological
insulator electronic states support the same topological surface states
that are the defining characteristic of the topological insulator. First
observed in spin-polarized angle resolved photoemission spectroscopy
(ARPES) in Sb [1], the helical surface states in the metallic systems
appear to be robust to at least mild disorder. We present an
investigation of the nature of these "topological conductors" - bulk
metals with helical surface states. We explore how the surface states
can survive the insulator being turned into a metal, in both clean and
disordered systems. We also explore magnetoelectric coupling
phenomena in these systems, which turn out to realize an analog of
the intrinsic anomalous Hall effect.


Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park


Collections: Engineering; Materials Science