Subgap states in two-dimensional spectroscopy of graphene-based superconducting hybrid junctions

Several recent works have predicted that unconventional and topological superconductivity can arise in graphene, either intrinsically or by proximity effect. Then, the analysis of the spectroscopic and transport properties in graphene would be a valuable source of information in the study of the eme...

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Autores:
Casas, Oscar E.
Levy Yeyati, Alfredo
Burset, Pablo
Herrera, William J.
Gómez Páez, Shirley
Tipo de recurso:
Fecha de publicación:
2019
Institución:
Universidad El Bosque
Repositorio:
Repositorio U. El Bosque
Idioma:
eng
OAI Identifier:
oai:repositorio.unbosque.edu.co:20.500.12495/1746
Acceso en línea:
http://hdl.handle.net/20.500.12495/1746
https://doi.org/10.1103/PhysRevB.99.144502
Palabra clave:
Superconductividad
Conductividad Eléctrica
Genes
Rights
License
Acceso cerrado
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dc.title.spa.fl_str_mv Subgap states in two-dimensional spectroscopy of graphene-based superconducting hybrid junctions
title Subgap states in two-dimensional spectroscopy of graphene-based superconducting hybrid junctions
spellingShingle Subgap states in two-dimensional spectroscopy of graphene-based superconducting hybrid junctions
Superconductividad
Conductividad Eléctrica
Genes
title_short Subgap states in two-dimensional spectroscopy of graphene-based superconducting hybrid junctions
title_full Subgap states in two-dimensional spectroscopy of graphene-based superconducting hybrid junctions
title_fullStr Subgap states in two-dimensional spectroscopy of graphene-based superconducting hybrid junctions
title_full_unstemmed Subgap states in two-dimensional spectroscopy of graphene-based superconducting hybrid junctions
title_sort Subgap states in two-dimensional spectroscopy of graphene-based superconducting hybrid junctions
dc.creator.fl_str_mv Casas, Oscar E.
Levy Yeyati, Alfredo
Burset, Pablo
Herrera, William J.
Gómez Páez, Shirley
dc.contributor.author.none.fl_str_mv Casas, Oscar E.
Levy Yeyati, Alfredo
Burset, Pablo
Herrera, William J.
Gómez Páez, Shirley
dc.subject.decs.spa.fl_str_mv Superconductividad
Conductividad Eléctrica
Genes
topic Superconductividad
Conductividad Eléctrica
Genes
description Several recent works have predicted that unconventional and topological superconductivity can arise in graphene, either intrinsically or by proximity effect. Then, the analysis of the spectroscopic and transport properties in graphene would be a valuable source of information in the study of the emergent superconducting order parameter. Using Green's functions techniques, we study the transport properties of a finite size ballistic graphene layer placed between a normal state electrode and a graphene lead with proximity-induced unconventional superconductivity. Our microscopic description of such a junction allows us to consider the effect of edge states in the graphene layer and the imperfect coupling to the electrodes. The tunnel conductance through the junction and the spectral density of states feature a rich interplay between graphene's edge states, interface bound states formed at the graphene-superconductor junction, Fabry-Pérot resonances originated from the finite size of the graphene layer, and the characteristic Andreev surface states of unconventional superconductors. Within our analytical formalism, we identify the separate contribution from each of these subgap states to the conductance and density of states. Our results provide an advisable tool to determine experimentally the pairing symmetry of unconventional superconductivity that can arise in graphene.
publishDate 2019
dc.date.accessioned.none.fl_str_mv 2019-09-24T21:23:33Z
dc.date.available.none.fl_str_mv 2019-09-24T21:23:33Z
dc.date.issued.none.fl_str_mv 2019
dc.type.spa.fl_str_mv article
dc.type.coarversion.fl_str_mv http://purl.org/coar/version/c_970fb48d4fbd8a85
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dc.type.local.spa.fl_str_mv artículo
dc.identifier.issn.none.fl_str_mv 2469-9969
dc.identifier.uri.none.fl_str_mv http://hdl.handle.net/20.500.12495/1746
dc.identifier.doi.none.fl_str_mv https://doi.org/10.1103/PhysRevB.99.144502
dc.identifier.instname.spa.fl_str_mv instname:Universidad El Bosque
dc.identifier.reponame.spa.fl_str_mv reponame:Repositorio Institucional Universidad El Bosque
dc.identifier.repourl.none.fl_str_mv repourl:https://repositorio.unbosque.edu.co
identifier_str_mv 2469-9969
instname:Universidad El Bosque
reponame:Repositorio Institucional Universidad El Bosque
repourl:https://repositorio.unbosque.edu.co
url http://hdl.handle.net/20.500.12495/1746
https://doi.org/10.1103/PhysRevB.99.144502
dc.language.iso.none.fl_str_mv eng
language eng
dc.relation.ispartofseries.spa.fl_str_mv Physical Review B, 2469-9950, Vol. 99, Nro, 14, 2019 P. 1445021 2-144502 15
dc.relation.uri.none.fl_str_mv https://journals.aps.org/prb/abstract/10.1103/PhysRevB.99.144502
dc.rights.coar.fl_str_mv http://purl.org/coar/access_right/c_abf2
dc.rights.local.spa.fl_str_mv Acceso cerrado
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dc.rights.creativecommons.none.fl_str_mv 2019
rights_invalid_str_mv Acceso cerrado
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dc.format.mimetype.none.fl_str_mv application/pdf
dc.publisher.spa.fl_str_mv American Physical Society
dc.publisher.journal.spa.fl_str_mv Physical Review B
institution Universidad El Bosque
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spelling Casas, Oscar E.Levy Yeyati, AlfredoBurset, PabloHerrera, William J.Gómez Páez, Shirley2019-09-24T21:23:33Z2019-09-24T21:23:33Z20192469-9969http://hdl.handle.net/20.500.12495/1746https://doi.org/10.1103/PhysRevB.99.144502instname:Universidad El Bosquereponame:Repositorio Institucional Universidad El Bosquerepourl:https://repositorio.unbosque.edu.coapplication/pdfengAmerican Physical SocietyPhysical Review BPhysical Review B, 2469-9950, Vol. 99, Nro, 14, 2019 P. 1445021 2-144502 15https://journals.aps.org/prb/abstract/10.1103/PhysRevB.99.144502Subgap states in two-dimensional spectroscopy of graphene-based superconducting hybrid junctionsarticleartículohttp://purl.org/coar/version/c_970fb48d4fbd8a85http://purl.org/coar/resource_type/c_6501SuperconductividadConductividad EléctricaGenesSeveral recent works have predicted that unconventional and topological superconductivity can arise in graphene, either intrinsically or by proximity effect. Then, the analysis of the spectroscopic and transport properties in graphene would be a valuable source of information in the study of the emergent superconducting order parameter. Using Green's functions techniques, we study the transport properties of a finite size ballistic graphene layer placed between a normal state electrode and a graphene lead with proximity-induced unconventional superconductivity. Our microscopic description of such a junction allows us to consider the effect of edge states in the graphene layer and the imperfect coupling to the electrodes. The tunnel conductance through the junction and the spectral density of states feature a rich interplay between graphene's edge states, interface bound states formed at the graphene-superconductor junction, Fabry-Pérot resonances originated from the finite size of the graphene layer, and the characteristic Andreev surface states of unconventional superconductors. Within our analytical formalism, we identify the separate contribution from each of these subgap states to the conductance and density of states. Our results provide an advisable tool to determine experimentally the pairing symmetry of unconventional superconductivity that can arise in graphene.Acceso cerradohttp://purl.org/coar/access_right/c_abf662019http://purl.org/coar/access_right/c_abf2ORIGINALCasas O.E., Páez S.G., Levy Yeyati A., Burset P., Herrera W.J._2019.pdfCasas O.E., Páez S.G., Levy Yeyati A., Burset P., Herrera W.J._2019.pdfapplication/pdf2510884https://repositorio.unbosque.edu.co/bitstreams/067c9959-da47-4a99-921c-631dc1bf1e9e/download7831d74fd4d23e12437f6fcaf421bd15MD51LICENSElicense.txtlicense.txttext/plain; charset=utf-81748https://repositorio.unbosque.edu.co/bitstreams/093805ed-f2e3-49c7-b73c-c555ea95c625/download8a4605be74aa9ea9d79846c1fba20a33MD52THUMBNAILCasas O.E., Páez S.G., Levy Yeyati A., Burset P., Herrera W.J._2019.pdf.jpgCasas O.E., Páez S.G., Levy Yeyati A., Burset P., Herrera W.J._2019.pdf.jpgIM Thumbnailimage/jpeg6772https://repositorio.unbosque.edu.co/bitstreams/a04c6373-eac4-475c-94db-5c6e095a8d3f/download259943c197f30557cc092079a479c6acMD53TEXTCasas O.E., Páez S.G., Levy Yeyati A., Burset P., Herrera W.J._2019.pdf.txtCasas O.E., Páez S.G., Levy Yeyati A., Burset P., Herrera W.J._2019.pdf.txtExtracted texttext/plain92894https://repositorio.unbosque.edu.co/bitstreams/30e149c0-15e5-4601-a46a-81fa4b54cce0/downloadef56dc7c784cba79621a74061873da36MD5420.500.12495/1746oai:repositorio.unbosque.edu.co:20.500.12495/17462024-02-07 03:15:37.973restrictedhttps://repositorio.unbosque.edu.coRepositorio Institucional Universidad El Bosquebibliotecas@biteca.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