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Condensed Matter Seminars
| Condensed Matter
Tuesday, February 7, 2012
Physics Building, Room 204
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[Host: Israel Klich]
"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 [D. Hsieh et al., Science 323, 919 (2009)],
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.
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