Flux sensitivity of quantum spin Hall rings
arXiv:1507.03898 · doi:10.1016/j.physe.2015.09.026
Abstract
We analyse the periodicity of persistent currents in quantum spin Hall loops, partly covered with an -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 to 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 -periodic persistent current in two distinct regimes, where one corresponds to a Josephson junction and the other one to an Aharonov-Bohm setup.
To appear in the special issue of Physica E, in memory of Markus Büttiker
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