Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.156803
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- U.S. Department of Energy [DE-AC02-05CH11231]
- Alexander von Humboldt Foundation
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A direct signature of electron transport at the metallic surface of a topological insulator is the Aharonov-Bohm oscillation observed in a recent study of Bi(2)Se(3) nanowires [Peng et al., Nature Mater. 9, 225 ( 2010)] where conductance was found to oscillate as a function of magnetic flux phi through the wire, with a period of one flux quantum phi(0) = h/e and maximum conductance at zero flux. This seemingly agrees neither with diffusive theory, which would predict a period of half a flux quantum, nor with ballistic theory, which in the simplest form predicts a period of phi(0) but a minimum at zero flux due to a nontrivial Berry phase in topological insulators. We show how h/e and h/2e flux oscillations of the conductance depend on doping and disorder strength, provide a possible explanation for the experiments, and discuss further experiments that could verify the theory.
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