Phonon engineering in proximity enhanced superconductor heterostructures

Abstract In this research, we tailor the phonon density of states (DOS) in thin superconducting films to suppress quasiparticle losses. We examine a model system of a proximity-enhanced three-layered Al/Nb/Al heterostructure and show that the local quantized phonon spectrum of the ultrathin Al cladd...

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Autores principales:	Yong-Chao Tang, Sangil Kwon, Hamid R. Mohebbi, David G. Cory, Guo-Xing Miao
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e23f42f145c9433b9f435c05c7062d13
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spelling	oai:doaj.org-article:e23f42f145c9433b9f435c05c7062d132021-12-02T15:05:47ZPhonon engineering in proximity enhanced superconductor heterostructures10.1038/s41598-017-04057-12045-2322https://doaj.org/article/e23f42f145c9433b9f435c05c7062d132017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04057-1https://doaj.org/toc/2045-2322Abstract In this research, we tailor the phonon density of states (DOS) in thin superconducting films to suppress quasiparticle losses. We examine a model system of a proximity-enhanced three-layered Al/Nb/Al heterostructure and show that the local quantized phonon spectrum of the ultrathin Al cladding layers in the heterostructure has a pronounced effect on the superconducting resonator’s quality factors. Instead of a monotonic increase of quality factors with decreasing temperatures, we observe the quality factor reaches a maximum at 1.2 K in 5/50/5 nm Al/Nb/Al microstrip resonators, because of a quantized phonon ladder. The phonon DOS may be engineered to enhance the performance of quantum devices.Yong-Chao TangSangil KwonHamid R. MohebbiDavid G. CoryGuo-Xing MiaoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yong-Chao Tang Sangil Kwon Hamid R. Mohebbi David G. Cory Guo-Xing Miao Phonon engineering in proximity enhanced superconductor heterostructures
description	Abstract In this research, we tailor the phonon density of states (DOS) in thin superconducting films to suppress quasiparticle losses. We examine a model system of a proximity-enhanced three-layered Al/Nb/Al heterostructure and show that the local quantized phonon spectrum of the ultrathin Al cladding layers in the heterostructure has a pronounced effect on the superconducting resonator’s quality factors. Instead of a monotonic increase of quality factors with decreasing temperatures, we observe the quality factor reaches a maximum at 1.2 K in 5/50/5 nm Al/Nb/Al microstrip resonators, because of a quantized phonon ladder. The phonon DOS may be engineered to enhance the performance of quantum devices.
format	article
author	Yong-Chao Tang Sangil Kwon Hamid R. Mohebbi David G. Cory Guo-Xing Miao
author_facet	Yong-Chao Tang Sangil Kwon Hamid R. Mohebbi David G. Cory Guo-Xing Miao
author_sort	Yong-Chao Tang
title	Phonon engineering in proximity enhanced superconductor heterostructures
title_short	Phonon engineering in proximity enhanced superconductor heterostructures
title_full	Phonon engineering in proximity enhanced superconductor heterostructures
title_fullStr	Phonon engineering in proximity enhanced superconductor heterostructures
title_full_unstemmed	Phonon engineering in proximity enhanced superconductor heterostructures
title_sort	phonon engineering in proximity enhanced superconductor heterostructures
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/e23f42f145c9433b9f435c05c7062d13
work_keys_str_mv	AT yongchaotang phononengineeringinproximityenhancedsuperconductorheterostructures AT sangilkwon phononengineeringinproximityenhancedsuperconductorheterostructures AT hamidrmohebbi phononengineeringinproximityenhancedsuperconductorheterostructures AT davidgcory phononengineeringinproximityenhancedsuperconductorheterostructures AT guoxingmiao phononengineeringinproximityenhancedsuperconductorheterostructures
_version_	1718388739060793344

Phonon engineering in proximity enhanced superconductor heterostructures

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