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

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Title: Time-resolved measurements of Cooper-pair radiative recombination in InAs quantum dots
Authors: Mou, S. S. Browse this author
Irie, H. Browse this author
Asano, Y. Browse this author
Akahane, K. Browse this author
Nakajima, H. Browse this author
Kumano, H. Browse this author →KAKEN DB
Sasaki, M. Browse this author
Murayama, A. Browse this author
Suemune, Ikuo Browse this author →KAKEN DB
Issue Date: 21-Aug-2015
Publisher: American Institute of Physics (AIP)
Journal Title: Journal of Applied Physics
Volume: 118
Issue: 7
Start Page: 073102-1
End Page: 073102-7
Publisher DOI: 10.1063/1.4928621
Abstract: 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 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 C is well explained with our theory including Cooper-pair recombination. 
Rights: © 2015 AIP Publishing LLC. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Appl. Phys. 118, 073102 (2015) and may be found at
Type: article
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 末宗 幾夫

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