Detalhes bibliográficos
Ano de defesa: |
2020 |
Autor(a) principal: |
Oliviero, Fabrizio Giovanni |
Orientador(a): |
Pereira, Rodrigo Gonçalves |
Banca de defesa: |
Não Informado pela instituição |
Tipo de documento: |
Dissertação
|
Tipo de acesso: |
Acesso aberto |
Idioma: |
por |
Instituição de defesa: |
Universidade Federal do Rio Grande do Norte
|
Programa de Pós-Graduação: |
PROGRAMA DE PÓS-GRADUAÇÃO EM FÍSICA
|
Departamento: |
Não Informado pela instituição
|
País: |
Brasil
|
Palavras-chave em Português: |
|
Link de acesso: |
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. |