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

Journal Article · Mon Nov 30 04:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4936888· OSTI ID:22486160

Baba, Shoji; Sailer, Juergen ^[1]; Deacon, Russell S. ^[2]; Oiwa, Akira ^[3]; Shibata, Kenji ^[4]; Hirakawa, Kazuhiko ^[4]; Tarucha, Seigo ^[1]

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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. The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047 (Japan)
4. Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505 (Japan)

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.

• OSTI ID: 22486160
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 22 Vol. 107; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COOPER PAIRS
CRITICAL FIELD
ELECTRODES
INDIUM ARSENIDES
JOSEPHSON JUNCTIONS
QUANTUM DOTS
TUNNEL EFFECT