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Title: Superconducting transport in single and parallel double InAs quantum dot Josephson junctions with Nb-based superconducting electrodes

We report conductance and supercurrent measurements for InAs single and parallel double quantum dot Josephson junctions contacted with Nb or NbTiN superconducting electrodes. Large superconducting gap energy, high critical field, and large switching current are observed, all reflecting the features of Nb-based electrodes. For the parallel double dots, we observe an enhanced supercurrent when both dots are on resonance, which may reflect split Cooper pair tunneling.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [3] ;  [5] ;  [3] ;  [1] ;  [6] ;  [3] ;  [3]
  1. Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
  2. Center for Emergent Matter Science (CEMS), RIKEN, Wako, Saitama 351-0198 (Japan)
  3. (Japan)
  4. The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047 (Japan)
  5. Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505 (Japan)
  6. (CEMS), RIKEN, Wako, Saitama 351-0198 (Japan)
Publication Date:
OSTI Identifier:
22486160
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 22; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COOPER PAIRS; CRITICAL FIELD; ELECTRODES; INDIUM ARSENIDES; JOSEPHSON JUNCTIONS; QUANTUM DOTS; TUNNEL EFFECT