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

Journal Article · Fri Aug 21 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4928621· OSTI ID:22494754

Mou, S. S.; Nakajima, H.; Kumano, H.; Irie, H. ^[1]; Asano, Y. ^[2]; Akahane, K.; Sasaki, M. ^[3]; Murayama, A. ^[4]

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1. NTT Basic Research Laboratories, NTT Corporation, Atsugi 243-0198 (Japan)
2. Graduate School of Engineering, Hokkaido University, Sapporo 060-8628 (Japan)
3. National Institute of Information and Communication Technology, Koganei 184-8795 (Japan)
4. Graduate School of Information Science and Technology, Hokkaido University, Sapporo 060-0814 (Japan)

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.

• OSTI ID: 22494754
• Journal Information: Journal of Applied Physics, Vol. 118, Issue 7; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

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