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Local and Non local Fraunhofer-like Pattern from an Edge-Stepped Topological Surface Josephson Current Distribution

Title
Local and Non local Fraunhofer-like Pattern from an Edge-Stepped Topological Surface Josephson Current Distribution
Authors
Lee, JHLee, GHPark, JLee, JNam, SGShin, YSKim, JSLee, HJ
POSTECH Authors
Lee, GHKim, JSLee, HJ
Date Issued
Sep-2014
Publisher
AMER CHEMICAL SOC
Abstract
We report a surface-dominant Josephson effect in superconductor-topological insulator-superconductor (S-TI-S) devices, where a Bi1.5Sb0.5Te1.7Se1.3 (BSTS) crystal flake was adopted as an intervening TI between Al superconducting electrodes. We observed a Fraunhofer-type critical current modulation in a perpendicular magnetic field in an Al-TI-Al junction for both local and nonlocal current biasing. Fraunhofer-type modulation of the differential resistance was also observed in a neighboring Au-TI-Au normal junction when it was nonlocally biased by the Al-TI-Al junction. In all cases, the Fraunhofer-like signal was highly robust to the magnetic field up to the critical field of the Al electrodes, corresponding to the edge-stepped nonuniform supercurrent density arising from the top and rough side surfaces of the BSTS flake, which strongly suggests that the Josephson coupling in a TI is established through the surface conducting channels that are topologically protected.
Keywords
Topological insulators; Josephson coupling Fraunhofer interference pattern; surface pair current; HGTE QUANTUM-WELLS; SINGLE DIRAC CONE; INSULATOR; SUPERCURRENT; TRANSPORT; STATE; PHASE
URI
http://oasis.postech.ac.kr/handle/2014.oak/13554
DOI
10.1021/NL501481B
ISSN
1530-6984
Article Type
Article
Citation
NANO LETTERS, vol. 14, no. 9, page. 5029 - 5034, 2014-09
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