Visualization of multifractal superconductivity in a two-dimensional transition metal dichalcogenide in the weak-disorder regime

Eigenstate multifractality is a distinctive feature of noninteracting disordered metals close to a metal-insulator transition, whose properties are expected to extend to superconductivity. While multifractality in three dimensions (3D) only develops near the critical point for specific strong-disord...

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Autores: Rubio-Verdú, Carmen, García-García, Antonio M., Ryu, Hyejin, Choi, Deung-Jang, Zaldívar, Javier, Tan, Shujie, Fan, Bo, Shen, Zhi-Xun, Mo, Sung-Kwan, Pascual, José I., Ugeda, Miguel M.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2020
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/225002
Acceso en línea:http://hdl.handle.net/10261/225002
Access Level:acceso abierto
Palabra clave:STM/STS
2D transition metal dichalcogenides
Superconductivity
Disorder
Multifractality
Quasiparticle interference
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spelling Visualization of multifractal superconductivity in a two-dimensional transition metal dichalcogenide in the weak-disorder regimeRubio-Verdú, CarmenGarcía-García, Antonio M.Ryu, HyejinChoi, Deung-JangZaldívar, JavierTan, ShujieFan, BoShen, Zhi-XunMo, Sung-KwanPascual, José I.Ugeda, Miguel M.STM/STS2D transition metal dichalcogenidesSuperconductivityDisorderMultifractalityQuasiparticle interferenceEigenstate multifractality is a distinctive feature of noninteracting disordered metals close to a metal-insulator transition, whose properties are expected to extend to superconductivity. While multifractality in three dimensions (3D) only develops near the critical point for specific strong-disorder strengths, multifractality in 2D systems is expected to be observable even for weak disorder. Here we provide evidence for multifractal features in the superconducting state of an intrinsic, weakly disordered single-layer NbSe2 by means of low-temperature scanning tunneling microscopy/spectroscopy. The superconducting gap, characterized by its width, depth, and coherence peaks' amplitude, shows a characteristic spatial modulation coincident with the periodicity of the quasiparticle interference pattern. The strong spatial inhomogeneity of the superconducting gap width, proportional to the local order parameter in the weak-disorder regime, follows a log-normal statistical distribution as well as a power-law decay of the two-point correlation function, in agreement with our theoretical model. Furthermore, the experimental singularity spectrum f(α) shows anomalous scaling behavior typical from 2D weakly disordered systems.We acknowledge financial support from AEI/FEDER-EU through the Maria de Maeztu unit of excellence MDM-2016-0618. This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under Contract No. DE-AC02-05CH11231. A.M.G.-G. acknowledges additional support from a Shanghai talent program and from the National Natural Science Foundation of China (NSFC) (Grant number 11874259).American Chemical SocietyMinisterio de Economía y Competitividad (España)Agencia Estatal de Investigación (España)European CommissionConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2020202020202020info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/225002reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MDM-2016-0618http://dx.doi.org/10.1021/acs.nanolett.0c01288Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2250022026-05-22T06:33:51Z
dc.title.none.fl_str_mv Visualization of multifractal superconductivity in a two-dimensional transition metal dichalcogenide in the weak-disorder regime
title Visualization of multifractal superconductivity in a two-dimensional transition metal dichalcogenide in the weak-disorder regime
spellingShingle Visualization of multifractal superconductivity in a two-dimensional transition metal dichalcogenide in the weak-disorder regime
Rubio-Verdú, Carmen
STM/STS
2D transition metal dichalcogenides
Superconductivity
Disorder
Multifractality
Quasiparticle interference
title_short Visualization of multifractal superconductivity in a two-dimensional transition metal dichalcogenide in the weak-disorder regime
title_full Visualization of multifractal superconductivity in a two-dimensional transition metal dichalcogenide in the weak-disorder regime
title_fullStr Visualization of multifractal superconductivity in a two-dimensional transition metal dichalcogenide in the weak-disorder regime
title_full_unstemmed Visualization of multifractal superconductivity in a two-dimensional transition metal dichalcogenide in the weak-disorder regime
title_sort Visualization of multifractal superconductivity in a two-dimensional transition metal dichalcogenide in the weak-disorder regime
dc.creator.none.fl_str_mv Rubio-Verdú, Carmen
García-García, Antonio M.
Ryu, Hyejin
Choi, Deung-Jang
Zaldívar, Javier
Tan, Shujie
Fan, Bo
Shen, Zhi-Xun
Mo, Sung-Kwan
Pascual, José I.
Ugeda, Miguel M.
author Rubio-Verdú, Carmen
author_facet Rubio-Verdú, Carmen
García-García, Antonio M.
Ryu, Hyejin
Choi, Deung-Jang
Zaldívar, Javier
Tan, Shujie
Fan, Bo
Shen, Zhi-Xun
Mo, Sung-Kwan
Pascual, José I.
Ugeda, Miguel M.
author_role author
author2 García-García, Antonio M.
Ryu, Hyejin
Choi, Deung-Jang
Zaldívar, Javier
Tan, Shujie
Fan, Bo
Shen, Zhi-Xun
Mo, Sung-Kwan
Pascual, José I.
Ugeda, Miguel M.
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Agencia Estatal de Investigación (España)
European Commission
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv STM/STS
2D transition metal dichalcogenides
Superconductivity
Disorder
Multifractality
Quasiparticle interference
topic STM/STS
2D transition metal dichalcogenides
Superconductivity
Disorder
Multifractality
Quasiparticle interference
description Eigenstate multifractality is a distinctive feature of noninteracting disordered metals close to a metal-insulator transition, whose properties are expected to extend to superconductivity. While multifractality in three dimensions (3D) only develops near the critical point for specific strong-disorder strengths, multifractality in 2D systems is expected to be observable even for weak disorder. Here we provide evidence for multifractal features in the superconducting state of an intrinsic, weakly disordered single-layer NbSe2 by means of low-temperature scanning tunneling microscopy/spectroscopy. The superconducting gap, characterized by its width, depth, and coherence peaks' amplitude, shows a characteristic spatial modulation coincident with the periodicity of the quasiparticle interference pattern. The strong spatial inhomogeneity of the superconducting gap width, proportional to the local order parameter in the weak-disorder regime, follows a log-normal statistical distribution as well as a power-law decay of the two-point correlation function, in agreement with our theoretical model. Furthermore, the experimental singularity spectrum f(α) shows anomalous scaling behavior typical from 2D weakly disordered systems.
publishDate 2020
dc.date.none.fl_str_mv 2020
2020
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/225002
url http://hdl.handle.net/10261/225002
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MDM-2016-0618
http://dx.doi.org/10.1021/acs.nanolett.0c01288
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Chemical Society
publisher.none.fl_str_mv American Chemical Society
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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