Gapless chiral spin liquid from a parton mean-field theory on the kagome lattice
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFRN |
Texto Completo: | https://repositorio.ufrn.br/jspui/handle/123456789/29974 |
Resumo: | Quantum spin liquids are among the most studied phases of matter which depart from the paradigm of symmetry breaking order and Fermi-liquid theory. In this work, we investigated a spin-1/2 Heisenberg model on the kagome lattice with exchange interaction Jd between spins connected by the diagonals of the hexagons and a staggered chiral interaction Jχ that couples the three spins in the triangles. Applying parton construction, we show that the model can exhibit a gapless chiral quantum spin liquid phase in the regime of dominant Jχ. The gapless phase is equivalent to the one found in other mean-field solutions based on Majorana fermions with symmetry protected line Fermi surfaces. Our goal is to study the changes in the spectrum of the spinons as a function of the ratio Jd/|Jχ| for two diferent cases of a speci c ansatz in the mean-field theory. We expect that in the regime of relevant Jd, a non-coplanar ordered magnetic state appears, the cuboc-2 state. The apparent phase transition is analyzed in terms of the mean-field orders parameters and the search for instabilities in the generalized susceptibility. This work provides a unique example of a phase transition between a chiral spin liquid and a non-trivial ordered magnetic state. |
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Oliviero, Fabrizio GiovanniFerraz Filho, ÁlvaroAndrade, Eric de Castro ePereira, Rodrigo Gonçalves2020-09-08T18:49:00Z2020-09-08T18:49:00Z2020-06-17OLIVIERO, Fabrizio Giovanni. Gapless chiral spin liquid from a parton mean-field theory on the kagome lattice. 2020. 81f. Dissertação (Mestrado em Física) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2020.https://repositorio.ufrn.br/jspui/handle/123456789/29974Quantum spin liquids are among the most studied phases of matter which depart from the paradigm of symmetry breaking order and Fermi-liquid theory. In this work, we investigated a spin-1/2 Heisenberg model on the kagome lattice with exchange interaction Jd between spins connected by the diagonals of the hexagons and a staggered chiral interaction Jχ that couples the three spins in the triangles. Applying parton construction, we show that the model can exhibit a gapless chiral quantum spin liquid phase in the regime of dominant Jχ. The gapless phase is equivalent to the one found in other mean-field solutions based on Majorana fermions with symmetry protected line Fermi surfaces. Our goal is to study the changes in the spectrum of the spinons as a function of the ratio Jd/|Jχ| for two diferent cases of a speci c ansatz in the mean-field theory. We expect that in the regime of relevant Jd, a non-coplanar ordered magnetic state appears, the cuboc-2 state. The apparent phase transition is analyzed in terms of the mean-field orders parameters and the search for instabilities in the generalized susceptibility. This work provides a unique example of a phase transition between a chiral spin liquid and a non-trivial ordered magnetic state.Os líquidos quânticos de spin estão entre as fases da matéria mais investigadas que se afastam do paradigma da quebra simultânea de simetria e da teoria líquido de Fermi. Neste trabalho, estudamos um modelo de Heisenberg de spin 1/2 na rede kagomé, com interação de troca Jd entre os spins conectados pelas diagonais dos hexágonos e com uma quiralidade escalar de fuxos alternados Jχ que acopla os três spins dos triângulos. Aplicamos um campo médio baseado na representação de pártons e mostramos que o modelo apresenta um líquido de spin quiral sem gap no regime em que Jχ é a interação dominante. A fase sem gap, é equivalente à outras fases que são obtidas a partir de soluções de campo médio utilizando representação de férmions de Majorana com superfícies de Fermi retilínia protegidas por simetria. Nosso objetivo é estudar as mudanças no espectro dos spínons em função da razão Jd/|Jχ| para dois casos de um ansatz na teoria de campo médio. Esperamos que no limite em que Jd é o acoplamento relevante, temos uma fase magnética com ordenamento não-coplanar; o estado cuboc-2. A transição de fase é analisada em termos dos parâmetros de ordem oriundos do campo médio e pela busca de instabilidades na susceptibilidade generalizada. Acreditamos que esse trabalho é importante porque fornece um exemplo de transição de fase entre um líquido de spin quiral e uma fase magnética ordenada não trivial.Conselho Nacional de Desenvolvimento Científico e Tecnológico - CNPqUniversidade Federal do Rio Grande do NortePROGRAMA DE PÓS-GRADUAÇÃO EM FÍSICAUFRNBrasilQuantum spin liquidsKagome latticeParton constructionMean-fieldGapless chiral spin liquidGapless chiral spin liquid from a parton mean-field theory on the kagome latticeinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/openAccessporreponame:Repositório Institucional da UFRNinstname:Universidade Federal do Rio Grande do Norte (UFRN)instacron:UFRNTEXTGaplesschiralspin_Oliviero_2020.pdf.txtGaplesschiralspin_Oliviero_2020.pdf.txtExtracted texttext/plain137901https://repositorio.ufrn.br/bitstream/123456789/29974/2/Gaplesschiralspin_Oliviero_2020.pdf.txt3b46b701cf39d3d99a48016b7043a9dbMD52THUMBNAILGaplesschiralspin_Oliviero_2020.pdf.jpgGaplesschiralspin_Oliviero_2020.pdf.jpgGenerated Thumbnailimage/jpeg1232https://repositorio.ufrn.br/bitstream/123456789/29974/3/Gaplesschiralspin_Oliviero_2020.pdf.jpgd5cd2d6225406fb1062d106c3d5b4cddMD53ORIGINALGaplesschiralspin_Oliviero_2020.pdfapplication/pdf5348538https://repositorio.ufrn.br/bitstream/123456789/29974/1/Gaplesschiralspin_Oliviero_2020.pdfbf7001caf00522dcabcb0d51c1c3f17cMD51123456789/299742020-09-13 04:57:42.947oai:https://repositorio.ufrn.br:123456789/29974Repositório de PublicaçõesPUBhttp://repositorio.ufrn.br/oai/opendoar:2020-09-13T07:57:42Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false |
dc.title.pt_BR.fl_str_mv |
Gapless chiral spin liquid from a parton mean-field theory on the kagome lattice |
title |
Gapless chiral spin liquid from a parton mean-field theory on the kagome lattice |
spellingShingle |
Gapless chiral spin liquid from a parton mean-field theory on the kagome lattice Oliviero, Fabrizio Giovanni Quantum spin liquids Kagome lattice Parton construction Mean-field Gapless chiral spin liquid |
title_short |
Gapless chiral spin liquid from a parton mean-field theory on the kagome lattice |
title_full |
Gapless chiral spin liquid from a parton mean-field theory on the kagome lattice |
title_fullStr |
Gapless chiral spin liquid from a parton mean-field theory on the kagome lattice |
title_full_unstemmed |
Gapless chiral spin liquid from a parton mean-field theory on the kagome lattice |
title_sort |
Gapless chiral spin liquid from a parton mean-field theory on the kagome lattice |
author |
Oliviero, Fabrizio Giovanni |
author_facet |
Oliviero, Fabrizio Giovanni |
author_role |
author |
dc.contributor.authorID.pt_BR.fl_str_mv |
|
dc.contributor.advisorID.pt_BR.fl_str_mv |
|
dc.contributor.referees1.none.fl_str_mv |
Ferraz Filho, Álvaro |
dc.contributor.referees1ID.pt_BR.fl_str_mv |
|
dc.contributor.referees2.none.fl_str_mv |
Andrade, Eric de Castro e |
dc.contributor.referees2ID.pt_BR.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Oliviero, Fabrizio Giovanni |
dc.contributor.advisor1.fl_str_mv |
Pereira, Rodrigo Gonçalves |
contributor_str_mv |
Pereira, Rodrigo Gonçalves |
dc.subject.por.fl_str_mv |
Quantum spin liquids Kagome lattice Parton construction Mean-field Gapless chiral spin liquid |
topic |
Quantum spin liquids Kagome lattice Parton construction Mean-field Gapless chiral spin liquid |
description |
Quantum spin liquids are among the most studied phases of matter which depart from the paradigm of symmetry breaking order and Fermi-liquid theory. In this work, we investigated a spin-1/2 Heisenberg model on the kagome lattice with exchange interaction Jd between spins connected by the diagonals of the hexagons and a staggered chiral interaction Jχ that couples the three spins in the triangles. Applying parton construction, we show that the model can exhibit a gapless chiral quantum spin liquid phase in the regime of dominant Jχ. The gapless phase is equivalent to the one found in other mean-field solutions based on Majorana fermions with symmetry protected line Fermi surfaces. Our goal is to study the changes in the spectrum of the spinons as a function of the ratio Jd/|Jχ| for two diferent cases of a speci c ansatz in the mean-field theory. We expect that in the regime of relevant Jd, a non-coplanar ordered magnetic state appears, the cuboc-2 state. The apparent phase transition is analyzed in terms of the mean-field orders parameters and the search for instabilities in the generalized susceptibility. This work provides a unique example of a phase transition between a chiral spin liquid and a non-trivial ordered magnetic state. |
publishDate |
2020 |
dc.date.accessioned.fl_str_mv |
2020-09-08T18:49:00Z |
dc.date.available.fl_str_mv |
2020-09-08T18:49:00Z |
dc.date.issued.fl_str_mv |
2020-06-17 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
OLIVIERO, Fabrizio Giovanni. Gapless chiral spin liquid from a parton mean-field theory on the kagome lattice. 2020. 81f. Dissertação (Mestrado em Física) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2020. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufrn.br/jspui/handle/123456789/29974 |
identifier_str_mv |
OLIVIERO, Fabrizio Giovanni. Gapless chiral spin liquid from a parton mean-field theory on the kagome lattice. 2020. 81f. Dissertação (Mestrado em Física) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2020. |
url |
https://repositorio.ufrn.br/jspui/handle/123456789/29974 |
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por |
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por |
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openAccess |
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Universidade Federal do Rio Grande do Norte |
dc.publisher.program.fl_str_mv |
PROGRAMA DE PÓS-GRADUAÇÃO EM FÍSICA |
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UFRN |
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Brasil |
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Universidade Federal do Rio Grande do Norte |
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