Stimulated emission of Cooper pairs in a high-temperature cuprate superconductor

The concept of stimulated emission of bosons has played an important role in modern science and technology, and constitutes the working principle for lasers. In a stimulated emission process, an incoming photon enhances the probability that an excited atomic state will transition to a lower energy s...

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Main Authors:	Zhang, Wentao, Miller, Tristan, Smallwood, Christopher L., Yoshida, Yoshiyuki, Eisaki, Hiroshi, Kaindl, R. A., Lee, Dung-Hai, Lanzara, Alessandra
Format:	Online
Language:	English
Published:	Nature Publishing Group 2016
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4929572/

id	pubmed-4929572
recordtype	oai_dc
spelling	pubmed-49295722016-07-06 Stimulated emission of Cooper pairs in a high-temperature cuprate superconductor Zhang, Wentao Miller, Tristan Smallwood, Christopher L. Yoshida, Yoshiyuki Eisaki, Hiroshi Kaindl, R. A. Lee, Dung-Hai Lanzara, Alessandra Article The concept of stimulated emission of bosons has played an important role in modern science and technology, and constitutes the working principle for lasers. In a stimulated emission process, an incoming photon enhances the probability that an excited atomic state will transition to a lower energy state and generate a second photon of the same energy. It is expected, but not experimentally shown, that stimulated emission contributes significantly to the zero resistance current in a superconductor by enhancing the probability that scattered Cooper pairs will return to the macroscopically occupied condensate instead of entering any other state. Here, we use time- and angle-resolved photoemission spectroscopy to study the initial rise of the non-equilibrium quasiparticle population in a Bi2Sr2CaCu2O8+δ cuprate superconductor induced by an ultrashort laser pulse. Our finding reveals significantly slower buildup of quasiparticles in the superconducting state than in the normal state. The slower buildup only occurs when the pump pulse is too weak to deplete the superconducting condensate, and for cuts inside the Fermi arc region. We propose this is a manifestation of stimulated recombination of broken Cooper pairs, and signals an important momentum space dichotomy in the formation of Cooper pairs inside and outside the Fermi arc region. Nature Publishing Group 2016-07-01 /pmc/articles/PMC4929572/ /pubmed/27364682 http://dx.doi.org/10.1038/srep29100 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Zhang, Wentao Miller, Tristan Smallwood, Christopher L. Yoshida, Yoshiyuki Eisaki, Hiroshi Kaindl, R. A. Lee, Dung-Hai Lanzara, Alessandra
spellingShingle	Zhang, Wentao Miller, Tristan Smallwood, Christopher L. Yoshida, Yoshiyuki Eisaki, Hiroshi Kaindl, R. A. Lee, Dung-Hai Lanzara, Alessandra Stimulated emission of Cooper pairs in a high-temperature cuprate superconductor
author_facet	Zhang, Wentao Miller, Tristan Smallwood, Christopher L. Yoshida, Yoshiyuki Eisaki, Hiroshi Kaindl, R. A. Lee, Dung-Hai Lanzara, Alessandra
author_sort	Zhang, Wentao
title	Stimulated emission of Cooper pairs in a high-temperature cuprate superconductor
title_short	Stimulated emission of Cooper pairs in a high-temperature cuprate superconductor
title_full	Stimulated emission of Cooper pairs in a high-temperature cuprate superconductor
title_fullStr	Stimulated emission of Cooper pairs in a high-temperature cuprate superconductor
title_full_unstemmed	Stimulated emission of Cooper pairs in a high-temperature cuprate superconductor
title_sort	stimulated emission of cooper pairs in a high-temperature cuprate superconductor
description	The concept of stimulated emission of bosons has played an important role in modern science and technology, and constitutes the working principle for lasers. In a stimulated emission process, an incoming photon enhances the probability that an excited atomic state will transition to a lower energy state and generate a second photon of the same energy. It is expected, but not experimentally shown, that stimulated emission contributes significantly to the zero resistance current in a superconductor by enhancing the probability that scattered Cooper pairs will return to the macroscopically occupied condensate instead of entering any other state. Here, we use time- and angle-resolved photoemission spectroscopy to study the initial rise of the non-equilibrium quasiparticle population in a Bi2Sr2CaCu2O8+δ cuprate superconductor induced by an ultrashort laser pulse. Our finding reveals significantly slower buildup of quasiparticles in the superconducting state than in the normal state. The slower buildup only occurs when the pump pulse is too weak to deplete the superconducting condensate, and for cuts inside the Fermi arc region. We propose this is a manifestation of stimulated recombination of broken Cooper pairs, and signals an important momentum space dichotomy in the formation of Cooper pairs inside and outside the Fermi arc region.
publisher	Nature Publishing Group
publishDate	2016
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4929572/
_version_	1613602927920807936

Stimulated emission of Cooper pairs in a high-temperature cuprate superconductor

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