paper

Anomalous Aharonov-Bohm conductance oscillations from topological insulator surface states

arXiv:1005.3542 · doi:10.1103/PhysRevLett.105.206601

Abstract

We study transport properties of a topological insulator nanowire when a magnetic field is applied along its length. We predict that with strong surface disorder, a characteristic signature of the band topology is revealed in Aharonov Bohm (AB) oscillations of the conductance. These oscillations have a component with anomalous period , and with conductance maxima at odd multiples of , i.e. when the AB phase for surface electrons is . This is intimately connected to the band topology and a surface curvature induced Berry phase, special to topological insulator surfaces. We discuss similarities and differences from recent experiments on BiSe nanoribbons, and optimal conditions for observing this effect.

7 pages, 2 figures

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