Quantum spherical spin glass : supersymmetry and annealing

Detalhes bibliográficos
Autor(a) principal: Silva, Pedro Castro Menezes Xavier de Mello e
Data de Publicação: 2007
Outros Autores: Theumann, Alba Graciela Rivas de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/109088
Resumo: We show that the effective action of the quantum spherical spin glass is invariant under a generalized form of Becchi-Rouet-Stora-Tyutin supersymmetry. The Ward identities associated with this invariance indicate that the spin glass order parameter must vanish, and as a result the annealed average is exact in this model. We present results for the free energy, entropy, and specific heat. Due to quantum effects, the entropy remains finite and the specific heat vanishes at zero temperature. Results for the phase diagram coincide with those obtained by different formalisms. At zero temperature we derive the scaling behavior with frequency of the dynamical susceptibility.
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spelling Silva, Pedro Castro Menezes Xavier de Mello eTheumann, Alba Graciela Rivas de2015-01-21T02:17:21Z20071098-0121http://hdl.handle.net/10183/109088000594607We show that the effective action of the quantum spherical spin glass is invariant under a generalized form of Becchi-Rouet-Stora-Tyutin supersymmetry. The Ward identities associated with this invariance indicate that the spin glass order parameter must vanish, and as a result the annealed average is exact in this model. We present results for the free energy, entropy, and specific heat. Due to quantum effects, the entropy remains finite and the specific heat vanishes at zero temperature. Results for the phase diagram coincide with those obtained by different formalisms. At zero temperature we derive the scaling behavior with frequency of the dynamical susceptibility.application/pdfengPhysical review. B, Condensed matter and materials physics. Woodbury. Vol. 75, no. 2 (Jan. 2007), 024433 7p.EntropiaSistemas hamiltonianosCalor especificoTransições magnéticasVidros de spinQuantum spherical spin glass : supersymmetry and annealingEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000594607.pdf000594607.pdfTexto completo (inglês)application/pdf107360http://www.lume.ufrgs.br/bitstream/10183/109088/1/000594607.pdf1acd66fdb0ee77c3710dff65dae945ebMD51TEXT000594607.pdf.txt000594607.pdf.txtExtracted Texttext/plain18667http://www.lume.ufrgs.br/bitstream/10183/109088/2/000594607.pdf.txt7ef66cb90f15454a7451cc2d68cb6bf8MD52THUMBNAIL000594607.pdf.jpg000594607.pdf.jpgGenerated Thumbnailimage/jpeg2038http://www.lume.ufrgs.br/bitstream/10183/109088/3/000594607.pdf.jpg559e8fb62f3fe21c3295551d700ede60MD5310183/1090882018-10-23 08:42:07.388oai:www.lume.ufrgs.br:10183/109088Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-23T11:42:07Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Quantum spherical spin glass : supersymmetry and annealing
title Quantum spherical spin glass : supersymmetry and annealing
spellingShingle Quantum spherical spin glass : supersymmetry and annealing
Silva, Pedro Castro Menezes Xavier de Mello e
Entropia
Sistemas hamiltonianos
Calor especifico
Transições magnéticas
Vidros de spin
title_short Quantum spherical spin glass : supersymmetry and annealing
title_full Quantum spherical spin glass : supersymmetry and annealing
title_fullStr Quantum spherical spin glass : supersymmetry and annealing
title_full_unstemmed Quantum spherical spin glass : supersymmetry and annealing
title_sort Quantum spherical spin glass : supersymmetry and annealing
author Silva, Pedro Castro Menezes Xavier de Mello e
author_facet Silva, Pedro Castro Menezes Xavier de Mello e
Theumann, Alba Graciela Rivas de
author_role author
author2 Theumann, Alba Graciela Rivas de
author2_role author
dc.contributor.author.fl_str_mv Silva, Pedro Castro Menezes Xavier de Mello e
Theumann, Alba Graciela Rivas de
dc.subject.por.fl_str_mv Entropia
Sistemas hamiltonianos
Calor especifico
Transições magnéticas
Vidros de spin
topic Entropia
Sistemas hamiltonianos
Calor especifico
Transições magnéticas
Vidros de spin
description We show that the effective action of the quantum spherical spin glass is invariant under a generalized form of Becchi-Rouet-Stora-Tyutin supersymmetry. The Ward identities associated with this invariance indicate that the spin glass order parameter must vanish, and as a result the annealed average is exact in this model. We present results for the free energy, entropy, and specific heat. Due to quantum effects, the entropy remains finite and the specific heat vanishes at zero temperature. Results for the phase diagram coincide with those obtained by different formalisms. At zero temperature we derive the scaling behavior with frequency of the dynamical susceptibility.
publishDate 2007
dc.date.issued.fl_str_mv 2007
dc.date.accessioned.fl_str_mv 2015-01-21T02:17:21Z
dc.type.driver.fl_str_mv Estrangeiro
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/109088
dc.identifier.issn.pt_BR.fl_str_mv 1098-0121
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dc.language.iso.fl_str_mv eng
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dc.relation.ispartof.pt_BR.fl_str_mv Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 75, no. 2 (Jan. 2007), 024433 7p.
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