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Title: Time-resolved measurements of Cooper-pair radiative recombination in InAs quantum dots

We studied InAs quantum dots (QDs) where electron Cooper pairs penetrate from an adjacent niobium (Nb) superconductor with the proximity effect. With time-resolved luminescence measurements at the wavelength around 1550 nm, we observed luminescence enhancement and reduction of luminescence decay time constants at temperature below the superconducting critical temperature (T{sub C}) of Nb. On the basis of these measurements, we propose a method to determine the contribution of Cooper-pair recombination in InAs QDs. We show that the luminescence enhancement measured below T{sub C} is well explained with our theory including Cooper-pair recombination.
Authors:
; ; ;  [1] ;  [2] ;  [3] ; ;  [4] ;  [5]
  1. Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0020 (Japan)
  2. NTT Basic Research Laboratories, NTT Corporation, Atsugi 243-0198 (Japan)
  3. Graduate School of Engineering, Hokkaido University, Sapporo 060-8628 (Japan)
  4. National Institute of Information and Communication Technology, Koganei 184-8795 (Japan)
  5. Graduate School of Information Science and Technology, Hokkaido University, Sapporo 060-0814 (Japan)
Publication Date:
OSTI Identifier:
22494754
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 7; 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 TEMPERATURE; ELECTRONS; INDIUM ARSENIDES; LUMINESCENCE; NIOBIUM; PROXIMITY EFFECT; QUANTUM DOTS; RECOMBINATION; SUPERCONDUCTORS; TIME RESOLUTION; WAVELENGTHS