Observation of superconducting collective modes from competing pairing instabilities in single-layer NbSe2

In certain unconventional superconductors with sizable electronic correla-tions, the availability of closely competing pairing channels leads to char-acteristic soft collective fluctuations of the order parameters, which leavefingerprints in many observables and allow the phase competition to bescru...

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Autores: Wan, Wen, Dreher, Paul, Harsh, Rishav, Guo, Haojie, Muñoz-Segovia, Daniel, Martínez Galera, Antonio Javier, Guinea, Francisco, Juan, Fernando de, Ugeda, Miguel M.
Tipo de documento: artigo
Data de publicação:2022
País:España
Recursos:Universidad Autónoma de Madrid
Repositório:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglês
OAI Identifier:oai:repositorio.uam.es:10486/713968
Acesso em linha:http://hdl.handle.net/10486/713968
https://dx.doi.org/10.1002/adma.202206078
Access Level:Acceso aberto
Palavra-chave:2D materials
Collective modes
Electronic structure
Molecular beam epitaxy
Superconductivity
Transition metal dichalcogenides
Física
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spelling Observation of superconducting collective modes from competing pairing instabilities in single-layer NbSe2Wan, WenDreher, PaulHarsh, RishavGuo, HaojieMuñoz-Segovia, DanielMartínez Galera, Antonio JavierGuinea, FranciscoJuan, Fernando deUgeda, Miguel M.2D materialsCollective modesElectronic structureMolecular beam epitaxySuperconductivityTransition metal dichalcogenidesFísicaIn certain unconventional superconductors with sizable electronic correla-tions, the availability of closely competing pairing channels leads to char-acteristic soft collective fluctuations of the order parameters, which leavefingerprints in many observables and allow the phase competition to bescrutinized. Superconducting layered materials, where electron–electroninteractions are enhanced with decreasing thickness, are promising can-didates to display these correlation effects. In this work, the existence ofa soft collective mode in single-layer NbSe 2 , observed as a characteristicresonance excitation in high-resolution tunneling spectra is reported. Thisresonance is observed along with higher harmonics, its frequency Ω/2Δ isanticorrelated with the local superconducting gap Δ, and its amplitudegradually vanishes by increasing the temperature and upon applying amagnetic field up to the critical values (TC and HC2 ), which sets an unambig-uous link to the superconducting state. Aided by a microscopic model thatcaptures the main experimental observations, this resonance is interpretedas a collective Leggett mode that represents the fluctuation toward a proxi-mate f-wave triplet state, due to subleading attraction in the triplet channel.These findings demonstrate the fundamental role of correlations in super-conducting 2D transition metal dichalcogenides, opening a path towardunconventional superconductivity in simple, scalable, and transferable 2D superconductorsW.W. and P.D. contributed equally to this work. The authors acknowledgefruitful discussions with Félix Ynduráin. The authors also thank Samuel Navas for providing bulk NbSe2 crystals. M.M.U. acknowledges supportby the ERC Starting grant LINKSPM (grant 758558) and the Spanish MINECO under grants no. PID2020-116619GB-C21. D.M.S. is supportedby a FPU predoctoral contract from MEFP No. FPU19/03195. F.J.acknowledges funding from the Spanish MCI/AEI/FEDER through grant PGC2018-101988-B-C21 and from the Basque government through PIBAgrant 2019-81Wiley-VCH GmbHDepartamento de Física de la Materia CondensadaFacultad de Ciencias20222022-10-01research articlehttp://purl.org/coar/resource_type/c_2df8fbb1VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10486/713968https://dx.doi.org/10.1002/adma.202206078reponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:repositorio.uam.es:10486/7139682026-06-23T12:46:27Z
dc.title.none.fl_str_mv Observation of superconducting collective modes from competing pairing instabilities in single-layer NbSe2
title Observation of superconducting collective modes from competing pairing instabilities in single-layer NbSe2
spellingShingle Observation of superconducting collective modes from competing pairing instabilities in single-layer NbSe2
Wan, Wen
2D materials
Collective modes
Electronic structure
Molecular beam epitaxy
Superconductivity
Transition metal dichalcogenides
Física
title_short Observation of superconducting collective modes from competing pairing instabilities in single-layer NbSe2
title_full Observation of superconducting collective modes from competing pairing instabilities in single-layer NbSe2
title_fullStr Observation of superconducting collective modes from competing pairing instabilities in single-layer NbSe2
title_full_unstemmed Observation of superconducting collective modes from competing pairing instabilities in single-layer NbSe2
title_sort Observation of superconducting collective modes from competing pairing instabilities in single-layer NbSe2
dc.creator.none.fl_str_mv Wan, Wen
Dreher, Paul
Harsh, Rishav
Guo, Haojie
Muñoz-Segovia, Daniel
Martínez Galera, Antonio Javier
Guinea, Francisco
Juan, Fernando de
Ugeda, Miguel M.
author Wan, Wen
author_facet Wan, Wen
Dreher, Paul
Harsh, Rishav
Guo, Haojie
Muñoz-Segovia, Daniel
Martínez Galera, Antonio Javier
Guinea, Francisco
Juan, Fernando de
Ugeda, Miguel M.
author_role author
author2 Dreher, Paul
Harsh, Rishav
Guo, Haojie
Muñoz-Segovia, Daniel
Martínez Galera, Antonio Javier
Guinea, Francisco
Juan, Fernando de
Ugeda, Miguel M.
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Departamento de Física de la Materia Condensada
Facultad de Ciencias
dc.subject.none.fl_str_mv 2D materials
Collective modes
Electronic structure
Molecular beam epitaxy
Superconductivity
Transition metal dichalcogenides
Física
topic 2D materials
Collective modes
Electronic structure
Molecular beam epitaxy
Superconductivity
Transition metal dichalcogenides
Física
description In certain unconventional superconductors with sizable electronic correla-tions, the availability of closely competing pairing channels leads to char-acteristic soft collective fluctuations of the order parameters, which leavefingerprints in many observables and allow the phase competition to bescrutinized. Superconducting layered materials, where electron–electroninteractions are enhanced with decreasing thickness, are promising can-didates to display these correlation effects. In this work, the existence ofa soft collective mode in single-layer NbSe 2 , observed as a characteristicresonance excitation in high-resolution tunneling spectra is reported. Thisresonance is observed along with higher harmonics, its frequency Ω/2Δ isanticorrelated with the local superconducting gap Δ, and its amplitudegradually vanishes by increasing the temperature and upon applying amagnetic field up to the critical values (TC and HC2 ), which sets an unambig-uous link to the superconducting state. Aided by a microscopic model thatcaptures the main experimental observations, this resonance is interpretedas a collective Leggett mode that represents the fluctuation toward a proxi-mate f-wave triplet state, due to subleading attraction in the triplet channel.These findings demonstrate the fundamental role of correlations in super-conducting 2D transition metal dichalcogenides, opening a path towardunconventional superconductivity in simple, scalable, and transferable 2D superconductors
publishDate 2022
dc.date.none.fl_str_mv 2022
2022-10-01
dc.type.none.fl_str_mv research article
http://purl.org/coar/resource_type/c_2df8fbb1
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10486/713968
https://dx.doi.org/10.1002/adma.202206078
url http://hdl.handle.net/10486/713968
https://dx.doi.org/10.1002/adma.202206078
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Wiley-VCH GmbH
publisher.none.fl_str_mv Wiley-VCH GmbH
dc.source.none.fl_str_mv reponame:Biblos-e Archivo. Repositorio Institucional de la UAM
instname:Universidad Autónoma de Madrid
instname_str Universidad Autónoma de Madrid
reponame_str Biblos-e Archivo. Repositorio Institucional de la UAM
collection Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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