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Cooling of nanomechanical vibrations by Andreev injection

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Title
Cooling of nanomechanical vibrations by Andreev injection
Author(s)
O. M. Bahrova; Kulinich, S. I.; Gorelik, L. Y.; Shekhter, R. I.; Hee Chul Park
Publication Date
2022-06
Journal
LOW TEMPERATURE PHYSICS, v.48, no.6, pp.476 - 482
Publisher
AIP Publishing
Abstract
A nanoelectromechanical weak link composed of a carbon nanotube suspended between two normal electrodes in a gap between two superconducting leads is considered. The nanotube is treated as a movable single level quantum dot in which the position-dependent superconducting order parameter is induced due to the Cooper pair tunneling. We show that electron tunneling processes significantly affect the state of the mechanical subsystem. We found that at a given direction of the applied voltage between the electrodes, the stationary state of the mechanical subsystem has a Boltzmann form with an effective temperature dependent on the parameters of the device. As this takes place, the effective temperature can reach significantly small values (cooling effect). We also demonstrate that nanotube fluctuations strongly affect the dc current through the system. The latter can be used to probe the predicted effects in an experiment. Published under an exclusive license by AIP Publishing.
URI
https://pr.ibs.re.kr/handle/8788114/12035
DOI
10.1063/10.0010443
ISSN
1063-777X
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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