Quantum interference in topological insulator Josephson junctions
Juntao Song, Haiwen Liu, Jie Liu, Yu-Xian Li, Robert Joynt, Qing-feng Sun, X. C. Xie
DOI 10.1103/PhysRevB.93.195302 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Using nonequilibrium Green's functions, we studied numerically the transport properties of a Josephson junction, superconductor-topological insulator-superconductor hybrid system. Our numerical calculation shows first that proximity-induced superconductivity is indeed observed in the edge states of a topological insulator adjoining two superconducting leads and second that the special characteristics of topological insulators endow the edge states with an enhanced proximity effect with a superconductor but do not forbid the bulk states to do the same. In a size-dependent analysis of the local current, it was found that a few residual bulk states can lead to measurable resistance, whereas because these bulk states spread over the whole sample, their contribution to the interference pattern is insignificant when the sample size is in the micrometer range. Based on these numerical results, it is concluded that the apparent disappearance of residual bulk states in the superconducting interference process as described by Hart et al. [Nat. Phys. 10, 638 (2014)] is just due to the effects of size: the contribution of the topological edge states outweighs that of the residual bulk states.
Similar papers
Quantum interference in topological insulator Josephson junctions
similarity 0.91Juntao Song et al. · 2016 · arXiv:1602.00813
Source status unknown — claims are unverified
Josephson and proximity effects on the surface of a topological insulator
similarity 0.90Takehito Yokoyama
Source status unknown — claims are unverified
Nonequilibrium Josephson Effect through Helical Edge States
similarity 0.89Driss M. Badiane et al.
Source status unknown — claims are unverified
Electrostatic effects and topological superconductivity in semiconductor–superconductor–magnetic-insulator hybrid wires
similarity 0.89Benjamin D. Woods & Tudor D. Stanescu
Source status unknown — claims are unverified
Unconventional Josephson Effect in Hybrid Superconductor-Topological Insulator Devices
similarity 0.89J. R. Williams et al.
Source status unknown — claims are unverified
Josephson and proximity effects on the surface of a topological insulator
similarity 0.89Takehito Yokoyama · 2012 · arXiv:1206.3831
Source status unknown — claims are unverified