Transport features of a topological superconducting nanowire with a quantum dot: Conductance and noise

Autores
Gruñeiro, Leonel José; Alvarado, Miguel Jose; Levy Yeyati, Alfredo; Arrachea, Liliana del Carmen
Año de publicación
2023
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We study two-terminal configurations in junctions between a topological superconducting wire with spin-orbit coupling and magnetic field, and an ordinary conductor with an embedded quantum dot. One of the signatures of the Majorana zero modes in the topological phase is a quantization of the zero-bias conductance at ⁡(=0)=2⁢2/ℎ. However, the finite size of the wires and the presence of the quantum dot in the junction generate more complicated features, which lead to deviations from this simple picture. Here, we analyze the behavior of the conductance at zero and finite bias ⁡() as a function of a gate voltage applied at the quantum dot in the case of a finite-length wire. We analyze the effect of the angle between the magnetic field and the orientation associated to the spin-orbit coupling. We provide a detailed description of the spectral features of the quantum wire weakly and also strongly coupled to the quantum dot and describe the conditions to have zero-energy states in these two regimes for both the topological and nontopological phases. We also analyze the concomitant behavior of the noise. We identify qualitative features that are useful to distinguish between the topological and nontopological phases. We show that in a strongly coupled quantum dot the simultaneous hybridization with the topological modes and the supragap states of the wire mask the signatures of the Majorana bound states in both the conductance and the Fano factor.
Fil: Gruñeiro, Leonel José. Universidad Nacional de San Martín; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias Físicas. - Universidad Nacional de San Martín. Instituto de Ciencias Físicas; Argentina
Fil: Alvarado, Miguel Jose. Universidad Autónoma de Madrid; España
Fil: Levy Yeyati, Alfredo. Universidad Autónoma de Madrid; España
Fil: Arrachea, Liliana del Carmen. Universidad Nacional de San Martín; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias Físicas. - Universidad Nacional de San Martín. Instituto de Ciencias Físicas; Argentina
Materia
Topological
Superconductors
Majorana
Transport
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/254285
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/254285
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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Transport features of a topological superconducting nanowire with a quantum dot: Conductance and noiseGruñeiro, Leonel JoséAlvarado, Miguel JoseLevy Yeyati, AlfredoArrachea, Liliana del CarmenTopologicalSuperconductorsMajoranaTransporthttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We study two-terminal configurations in junctions between a topological superconducting wire with spin-orbit coupling and magnetic field, and an ordinary conductor with an embedded quantum dot. One of the signatures of the Majorana zero modes in the topological phase is a quantization of the zero-bias conductance at ⁡(=0)=2⁢2/ℎ. However, the finite size of the wires and the presence of the quantum dot in the junction generate more complicated features, which lead to deviations from this simple picture. Here, we analyze the behavior of the conductance at zero and finite bias ⁡() as a function of a gate voltage applied at the quantum dot in the case of a finite-length wire. We analyze the effect of the angle between the magnetic field and the orientation associated to the spin-orbit coupling. We provide a detailed description of the spectral features of the quantum wire weakly and also strongly coupled to the quantum dot and describe the conditions to have zero-energy states in these two regimes for both the topological and nontopological phases. We also analyze the concomitant behavior of the noise. We identify qualitative features that are useful to distinguish between the topological and nontopological phases. We show that in a strongly coupled quantum dot the simultaneous hybridization with the topological modes and the supragap states of the wire mask the signatures of the Majorana bound states in both the conductance and the Fano factor.Fil: Gruñeiro, Leonel José. Universidad Nacional de San Martín; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias Físicas. - Universidad Nacional de San Martín. Instituto de Ciencias Físicas; ArgentinaFil: Alvarado, Miguel Jose. Universidad Autónoma de Madrid; EspañaFil: Levy Yeyati, Alfredo. Universidad Autónoma de Madrid; EspañaFil: Arrachea, Liliana del Carmen. Universidad Nacional de San Martín; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias Físicas. - Universidad Nacional de San Martín. Instituto de Ciencias Físicas; ArgentinaAmerican Physical Society2023-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/254285Gruñeiro, Leonel José; Alvarado, Miguel Jose; Levy Yeyati, Alfredo; Arrachea, Liliana del Carmen; Transport features of a topological superconducting nanowire with a quantum dot: Conductance and noise; American Physical Society; Physical Review B; 108; 4; 7-2023; 1-162469-99502469-9969CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://link.aps.org/doi/10.1103/PhysRevB.108.045418info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.108.045418info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/2305.02040info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:40:08Zoai:ri.conicet.gov.ar:11336/254285instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:40:08.492CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Transport features of a topological superconducting nanowire with a quantum dot: Conductance and noise
title Transport features of a topological superconducting nanowire with a quantum dot: Conductance and noise
spellingShingle Transport features of a topological superconducting nanowire with a quantum dot: Conductance and noise
Gruñeiro, Leonel José
Topological
Superconductors
Majorana
Transport
title_short Transport features of a topological superconducting nanowire with a quantum dot: Conductance and noise
title_full Transport features of a topological superconducting nanowire with a quantum dot: Conductance and noise
title_fullStr Transport features of a topological superconducting nanowire with a quantum dot: Conductance and noise
title_full_unstemmed Transport features of a topological superconducting nanowire with a quantum dot: Conductance and noise
title_sort Transport features of a topological superconducting nanowire with a quantum dot: Conductance and noise
dc.creator.none.fl_str_mv Gruñeiro, Leonel José
Alvarado, Miguel Jose
Levy Yeyati, Alfredo
Arrachea, Liliana del Carmen
author Gruñeiro, Leonel José
author_facet Gruñeiro, Leonel José
Alvarado, Miguel Jose
Levy Yeyati, Alfredo
Arrachea, Liliana del Carmen
author_role author
author2 Alvarado, Miguel Jose
Levy Yeyati, Alfredo
Arrachea, Liliana del Carmen
author2_role author
author
author
dc.subject.none.fl_str_mv Topological
Superconductors
Majorana
Transport
topic Topological
Superconductors
Majorana
Transport
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We study two-terminal configurations in junctions between a topological superconducting wire with spin-orbit coupling and magnetic field, and an ordinary conductor with an embedded quantum dot. One of the signatures of the Majorana zero modes in the topological phase is a quantization of the zero-bias conductance at ⁡(=0)=2⁢2/ℎ. However, the finite size of the wires and the presence of the quantum dot in the junction generate more complicated features, which lead to deviations from this simple picture. Here, we analyze the behavior of the conductance at zero and finite bias ⁡() as a function of a gate voltage applied at the quantum dot in the case of a finite-length wire. We analyze the effect of the angle between the magnetic field and the orientation associated to the spin-orbit coupling. We provide a detailed description of the spectral features of the quantum wire weakly and also strongly coupled to the quantum dot and describe the conditions to have zero-energy states in these two regimes for both the topological and nontopological phases. We also analyze the concomitant behavior of the noise. We identify qualitative features that are useful to distinguish between the topological and nontopological phases. We show that in a strongly coupled quantum dot the simultaneous hybridization with the topological modes and the supragap states of the wire mask the signatures of the Majorana bound states in both the conductance and the Fano factor.
Fil: Gruñeiro, Leonel José. Universidad Nacional de San Martín; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias Físicas. - Universidad Nacional de San Martín. Instituto de Ciencias Físicas; Argentina
Fil: Alvarado, Miguel Jose. Universidad Autónoma de Madrid; España
Fil: Levy Yeyati, Alfredo. Universidad Autónoma de Madrid; España
Fil: Arrachea, Liliana del Carmen. Universidad Nacional de San Martín; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias Físicas. - Universidad Nacional de San Martín. Instituto de Ciencias Físicas; Argentina
description We study two-terminal configurations in junctions between a topological superconducting wire with spin-orbit coupling and magnetic field, and an ordinary conductor with an embedded quantum dot. One of the signatures of the Majorana zero modes in the topological phase is a quantization of the zero-bias conductance at ⁡(=0)=2⁢2/ℎ. However, the finite size of the wires and the presence of the quantum dot in the junction generate more complicated features, which lead to deviations from this simple picture. Here, we analyze the behavior of the conductance at zero and finite bias ⁡() as a function of a gate voltage applied at the quantum dot in the case of a finite-length wire. We analyze the effect of the angle between the magnetic field and the orientation associated to the spin-orbit coupling. We provide a detailed description of the spectral features of the quantum wire weakly and also strongly coupled to the quantum dot and describe the conditions to have zero-energy states in these two regimes for both the topological and nontopological phases. We also analyze the concomitant behavior of the noise. We identify qualitative features that are useful to distinguish between the topological and nontopological phases. We show that in a strongly coupled quantum dot the simultaneous hybridization with the topological modes and the supragap states of the wire mask the signatures of the Majorana bound states in both the conductance and the Fano factor.
publishDate 2023
dc.date.none.fl_str_mv 2023-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/254285
Gruñeiro, Leonel José; Alvarado, Miguel Jose; Levy Yeyati, Alfredo; Arrachea, Liliana del Carmen; Transport features of a topological superconducting nanowire with a quantum dot: Conductance and noise; American Physical Society; Physical Review B; 108; 4; 7-2023; 1-16
2469-9950
2469-9969
CONICET Digital
CONICET
url http://hdl.handle.net/11336/254285
identifier_str_mv Gruñeiro, Leonel José; Alvarado, Miguel Jose; Levy Yeyati, Alfredo; Arrachea, Liliana del Carmen; Transport features of a topological superconducting nanowire with a quantum dot: Conductance and noise; American Physical Society; Physical Review B; 108; 4; 7-2023; 1-16
2469-9950
2469-9969
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://link.aps.org/doi/10.1103/PhysRevB.108.045418
info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.108.045418
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/2305.02040
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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