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 tim...

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Bibliographic Details
Published in:Journal of applied physics 2015-08, Vol.118 (7)
Main Authors: Mou, S. S., Irie, H., Asano, Y., Akahane, K., Nakajima, H., Kumano, H., Sasaki, M., Murayama, A., Suemune, I.
Format: Article
Language:English
Subjects:
Applied physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COOPER PAIRS
CRITICAL TEMPERATURE
ELECTRONS
INDIUM ARSENIDES
LUMINESCENCE
NIOBIUM
PROXIMITY EFFECT
Proximity effect (electricity)
QUANTUM DOTS
Radiative recombination
RECOMBINATION
SUPERCONDUCTORS
Time measurement
TIME RESOLUTION
WAVELENGTHS
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Summary: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 (TC) 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 TC is well explained with our theory including Cooper-pair recombination.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4928621