期刊
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
卷 82, 期 -, 页码 185-190出版社
ELSEVIER
DOI: 10.1016/j.physe.2016.02.029
关键词
Topological insulators; Superconductivity; Persistent current
We analyze the periodicity of persistent currents in quantum spin Hall loops, partly covered with an s wave superconductor, in the presence of a flux tube. Much like in normal (non-helical) metals, the periodicity of the single-particle spectrum goes from Phi(0) = hle to Phi(0)/2 as the length of the superconductor is increased past the coherence length of the superconductor. We further analyze the periodicity of the persistent current, which is a many-body effect. Interestingly, time reversal symmetry and parity conservation can significantly change the period. We find a 2 Phi(0)-periodic persistent current in two distinct regimes, where one corresponds to a Josephson junction and the other one to an Aharonov-Bohm setup. (C) 2016 Published by Elsevier B.V.
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