Unveiling Majorana quasiparticles by a quantum phase transition: Proposal of a current switch
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1103/PhysRevB.94.125426 http://hdl.handle.net/11449/173609 |
Resumo: | We propose a theoretical approach based on an interferometer composed by two quantum dots asymmetrically coupled to isolated Majorana quasiparticles (MQPs), lying on the edges of two topological Kitaev chains, respectively, via couplings (t+Δ) and (Δ-t). This setup enables us to probe MQPs in a quite distinct way from the zero-bias peak feature. Most importantly, the system behaves as a current switch made by two distinct paths: (i) for the upper dot connected to both chains, the device perceives both MQPs as an ordinary fermion and the current crosses solely the lower dot, since current in the upper dot is prevented due to the presence of the superconducting gap; and (ii) by suppressing slightly the hybridization of the upper dot with one chain, the current is abruptly switched to flow through this dot, once a trapped electron as a bound state in the continuum (BIC) [Phys. Rev. B 93, 165116 (2016)2469-995010.1103/PhysRevB.93.165116] appears in the lower dot. Such a current switch between upper and lower dots characterizes the quantum phase transition (QPT) proposed here, being the ratio t/Δ the control parameter of the transition. This QPT is associated with a change from an ordinary fermionic excitation regime to a MQP in the interferometer, which enables not only the fundamental revealing of MQPs, but also yields a current switch assisted by them. |
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Unveiling Majorana quasiparticles by a quantum phase transition: Proposal of a current switchWe propose a theoretical approach based on an interferometer composed by two quantum dots asymmetrically coupled to isolated Majorana quasiparticles (MQPs), lying on the edges of two topological Kitaev chains, respectively, via couplings (t+Δ) and (Δ-t). This setup enables us to probe MQPs in a quite distinct way from the zero-bias peak feature. Most importantly, the system behaves as a current switch made by two distinct paths: (i) for the upper dot connected to both chains, the device perceives both MQPs as an ordinary fermion and the current crosses solely the lower dot, since current in the upper dot is prevented due to the presence of the superconducting gap; and (ii) by suppressing slightly the hybridization of the upper dot with one chain, the current is abruptly switched to flow through this dot, once a trapped electron as a bound state in the continuum (BIC) [Phys. Rev. B 93, 165116 (2016)2469-995010.1103/PhysRevB.93.165116] appears in the lower dot. Such a current switch between upper and lower dots characterizes the quantum phase transition (QPT) proposed here, being the ratio t/Δ the control parameter of the transition. This QPT is associated with a change from an ordinary fermionic excitation regime to a MQP in the interferometer, which enables not only the fundamental revealing of MQPs, but also yields a current switch assisted by them.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Departamento de Física e Química Unesp - Univ Estadual PaulistaIGCE Unesp - Univ Estadual Paulista Departamento de FísicaInstituto de Física de São Carlos Universidade de São Paulo, C.P. 369Instituto de Física Universidade Federal FluminenseInternational Institute of Physics Universidade Federal Do Rio Grande Do NorteDepartamento de Física Teórica e Experimental Universidade Federal Do Rio Grande Do NorteDepartamento de Física e Química Unesp - Univ Estadual PaulistaIGCE Unesp - Univ Estadual Paulista Departamento de FísicaUniversidade Estadual Paulista (Unesp)Universidade de São Paulo (USP)Universidade Federal Fluminense (UFF)Universidade Federal Do Rio Grande Do NorteDessotti, F. A. [UNESP]Ricco, L. S. [UNESP]Marques, Y. [UNESP]Guessi, L. H. [UNESP]Yoshida, M. [UNESP]Figueira, M. S.De Souza, M. [UNESP]Sodano, PasqualeSeridonio, A. C. [UNESP]2018-12-11T17:06:47Z2018-12-11T17:06:47Z2016-09-16info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://dx.doi.org/10.1103/PhysRevB.94.125426Physical Review B, v. 94, n. 12, 2016.2469-99692469-9950http://hdl.handle.net/11449/17360910.1103/PhysRevB.94.1254262-s2.0-849912438002-s2.0-84991243800.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPhysical Review Binfo:eu-repo/semantics/openAccess2023-11-04T06:11:04Zoai:repositorio.unesp.br:11449/173609Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:54:35.945532Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Unveiling Majorana quasiparticles by a quantum phase transition: Proposal of a current switch |
title |
Unveiling Majorana quasiparticles by a quantum phase transition: Proposal of a current switch |
spellingShingle |
Unveiling Majorana quasiparticles by a quantum phase transition: Proposal of a current switch Dessotti, F. A. [UNESP] |
title_short |
Unveiling Majorana quasiparticles by a quantum phase transition: Proposal of a current switch |
title_full |
Unveiling Majorana quasiparticles by a quantum phase transition: Proposal of a current switch |
title_fullStr |
Unveiling Majorana quasiparticles by a quantum phase transition: Proposal of a current switch |
title_full_unstemmed |
Unveiling Majorana quasiparticles by a quantum phase transition: Proposal of a current switch |
title_sort |
Unveiling Majorana quasiparticles by a quantum phase transition: Proposal of a current switch |
author |
Dessotti, F. A. [UNESP] |
author_facet |
Dessotti, F. A. [UNESP] Ricco, L. S. [UNESP] Marques, Y. [UNESP] Guessi, L. H. [UNESP] Yoshida, M. [UNESP] Figueira, M. S. De Souza, M. [UNESP] Sodano, Pasquale Seridonio, A. C. [UNESP] |
author_role |
author |
author2 |
Ricco, L. S. [UNESP] Marques, Y. [UNESP] Guessi, L. H. [UNESP] Yoshida, M. [UNESP] Figueira, M. S. De Souza, M. [UNESP] Sodano, Pasquale Seridonio, A. C. [UNESP] |
author2_role |
author author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade de São Paulo (USP) Universidade Federal Fluminense (UFF) Universidade Federal Do Rio Grande Do Norte |
dc.contributor.author.fl_str_mv |
Dessotti, F. A. [UNESP] Ricco, L. S. [UNESP] Marques, Y. [UNESP] Guessi, L. H. [UNESP] Yoshida, M. [UNESP] Figueira, M. S. De Souza, M. [UNESP] Sodano, Pasquale Seridonio, A. C. [UNESP] |
description |
We propose a theoretical approach based on an interferometer composed by two quantum dots asymmetrically coupled to isolated Majorana quasiparticles (MQPs), lying on the edges of two topological Kitaev chains, respectively, via couplings (t+Δ) and (Δ-t). This setup enables us to probe MQPs in a quite distinct way from the zero-bias peak feature. Most importantly, the system behaves as a current switch made by two distinct paths: (i) for the upper dot connected to both chains, the device perceives both MQPs as an ordinary fermion and the current crosses solely the lower dot, since current in the upper dot is prevented due to the presence of the superconducting gap; and (ii) by suppressing slightly the hybridization of the upper dot with one chain, the current is abruptly switched to flow through this dot, once a trapped electron as a bound state in the continuum (BIC) [Phys. Rev. B 93, 165116 (2016)2469-995010.1103/PhysRevB.93.165116] appears in the lower dot. Such a current switch between upper and lower dots characterizes the quantum phase transition (QPT) proposed here, being the ratio t/Δ the control parameter of the transition. This QPT is associated with a change from an ordinary fermionic excitation regime to a MQP in the interferometer, which enables not only the fundamental revealing of MQPs, but also yields a current switch assisted by them. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-09-16 2018-12-11T17:06:47Z 2018-12-11T17:06:47Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1103/PhysRevB.94.125426 Physical Review B, v. 94, n. 12, 2016. 2469-9969 2469-9950 http://hdl.handle.net/11449/173609 10.1103/PhysRevB.94.125426 2-s2.0-84991243800 2-s2.0-84991243800.pdf |
url |
http://dx.doi.org/10.1103/PhysRevB.94.125426 http://hdl.handle.net/11449/173609 |
identifier_str_mv |
Physical Review B, v. 94, n. 12, 2016. 2469-9969 2469-9950 10.1103/PhysRevB.94.125426 2-s2.0-84991243800 2-s2.0-84991243800.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Physical Review B |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
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1808128719453159424 |