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Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Sci+Rep 2017 ; 7 (ä): ä Nephropedia Template TP
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Supercurrent switch in ? topological junctions based upon a narrow quantum spin Hall insulator #MMPMID28878292
Yu Q; Tao Z; Song J; Tao YC; Wang J
Sci Rep 2017[]; 7 (ä): ä PMID28878292show ga
The narrow quantum spin Hall (QSH) insulator is characterized by interedge coupling, which could feature exotic transport phenomena, and thus serves as the key element for topological superconducting electronic devices. Herein, we theoretically explore possible Josephson ? states in a QSH insulator strip touching on two s-wave superconductors in the presence of the interedge coupling. It is shown that the interedge coupling could give rise to a 0???? transition modulated by the gate voltage, originating from an additional ? phase difference caused by the interedge backscattering. The 0???? transition in turn can manifest the helical spin texture of the edge states. A considerable residual value of the supercurrent at the 0???? transition point is always exhibited, suggesting a very efficient performance of the device as a supercurrent switch. Moreover, the region of coexisting 0 and ? states is found fairly large, which can be used to improve accuracy in the design of a ? superconducting quantum interference device.