Anomalous Aharonov-Bohm conductance oscillations from topological insulator surface states

Details Anomalous Aharonov-Bohm conductance oscillations from topological insulator surface states Anomalous Aharonov-Bohm conductance oscillations from topological insulator surface states

2010-05-19

arxiv.org/abs/1005.3542v1

Phys. Rev. Lett. 105, 206601 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.105.206601

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 $\Phi_0=hc/e$, and with conductance maxima at odd multiples of $\frac12\Phi_0$, i.e. when the AB phase for surface electrons is $\pi$. 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 Bi$_2$Se$_3$ nanoribbons, and optimal conditions for observing this effect.

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