Gapped spectrum in pair-superfluid bosons

We study the ground state of a bilayer system of dipolar bosons with dipoles oriented by an external field perpendicularly to the two parallel planes. By decreasing the interlayer distance, for a fixed value of the strength of the dipolar interaction, the system undergoes a quantum phase transition...

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Detalles Bibliográficos
Autores: Astrakharchik, Grigori|||0000-0003-0394-8094, Zillich, Robert E., Mazzanti Castrillejo, Fernando Pablo|||0000-0001-6641-0609, Boronat Medico, Jordi|||0000-0002-0273-3457
Tipo de recurso: artículo
Fecha de publicación:2016
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/102969
Acceso en línea:https://hdl.handle.net/2117/102969
https://dx.doi.org/10.1103/PhysRevA.94.063630
Access Level:acceso abierto
Palabra clave:Bosons
bilayer system dipolar bosons
Àrees temàtiques de la UPC::Física
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spelling Gapped spectrum in pair-superfluid bosonsAstrakharchik, Grigori|||0000-0003-0394-8094Zillich, Robert E.Mazzanti Castrillejo, Fernando Pablo|||0000-0001-6641-0609Boronat Medico, Jordi|||0000-0002-0273-3457Bosonsbilayer system dipolar bosonsBosonsÀrees temàtiques de la UPC::FísicaWe study the ground state of a bilayer system of dipolar bosons with dipoles oriented by an external field perpendicularly to the two parallel planes. By decreasing the interlayer distance, for a fixed value of the strength of the dipolar interaction, the system undergoes a quantum phase transition from an atomic to a pair superfluid. We investigate the excitation spectrum on both sides of this transition by using two microscopic approaches. Quantum Monte Carlo methods are employed to obtain the static structure factors and intermediate scattering functions in imaginary time. The dynamic response is calculated using both the correlated basis functions (CBF) method and the approximate inversion of the Laplace transform of the quantum Monte Carlo imaginary time data. In the atomic phase, both the density and spin excitations are gapless. However, in the pair-superfluid phase a gap opens in the excitation energy of the spin mode. For small separation between layers, the minimal spin excitation energy equals the binding energy of a dimer and is twice the gap value.20162016-12-2220172017-03-28journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/102969https://dx.doi.org/10.1103/PhysRevA.94.063630reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1029692026-05-27T15:37:01Z
dc.title.none.fl_str_mv Gapped spectrum in pair-superfluid bosons
title Gapped spectrum in pair-superfluid bosons
spellingShingle Gapped spectrum in pair-superfluid bosons
Astrakharchik, Grigori|||0000-0003-0394-8094
Bosons
bilayer system dipolar bosons
Bosons
Àrees temàtiques de la UPC::Física
title_short Gapped spectrum in pair-superfluid bosons
title_full Gapped spectrum in pair-superfluid bosons
title_fullStr Gapped spectrum in pair-superfluid bosons
title_full_unstemmed Gapped spectrum in pair-superfluid bosons
title_sort Gapped spectrum in pair-superfluid bosons
dc.creator.none.fl_str_mv Astrakharchik, Grigori|||0000-0003-0394-8094
Zillich, Robert E.
Mazzanti Castrillejo, Fernando Pablo|||0000-0001-6641-0609
Boronat Medico, Jordi|||0000-0002-0273-3457
author Astrakharchik, Grigori|||0000-0003-0394-8094
author_facet Astrakharchik, Grigori|||0000-0003-0394-8094
Zillich, Robert E.
Mazzanti Castrillejo, Fernando Pablo|||0000-0001-6641-0609
Boronat Medico, Jordi|||0000-0002-0273-3457
author_role author
author2 Zillich, Robert E.
Mazzanti Castrillejo, Fernando Pablo|||0000-0001-6641-0609
Boronat Medico, Jordi|||0000-0002-0273-3457
author2_role author
author
author
dc.subject.none.fl_str_mv Bosons
bilayer system dipolar bosons
Bosons
Àrees temàtiques de la UPC::Física
topic Bosons
bilayer system dipolar bosons
Bosons
Àrees temàtiques de la UPC::Física
description We study the ground state of a bilayer system of dipolar bosons with dipoles oriented by an external field perpendicularly to the two parallel planes. By decreasing the interlayer distance, for a fixed value of the strength of the dipolar interaction, the system undergoes a quantum phase transition from an atomic to a pair superfluid. We investigate the excitation spectrum on both sides of this transition by using two microscopic approaches. Quantum Monte Carlo methods are employed to obtain the static structure factors and intermediate scattering functions in imaginary time. The dynamic response is calculated using both the correlated basis functions (CBF) method and the approximate inversion of the Laplace transform of the quantum Monte Carlo imaginary time data. In the atomic phase, both the density and spin excitations are gapless. However, in the pair-superfluid phase a gap opens in the excitation energy of the spin mode. For small separation between layers, the minimal spin excitation energy equals the binding energy of a dimer and is twice the gap value.
publishDate 2016
dc.date.none.fl_str_mv 2016
2016-12-22
2017
2017-03-28
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/102969
https://dx.doi.org/10.1103/PhysRevA.94.063630
url https://hdl.handle.net/2117/102969
https://dx.doi.org/10.1103/PhysRevA.94.063630
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-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
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-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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