Triangular-lattice anisotropic dimerized Heisenberg antiferromagnet: Stability and excitations of the quantum paramagnetic phase

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorTechnische Universität Dresden-
Autor(es): dc.creatorDoretto, R. L.-
Autor(es): dc.creatorVojta, Matthias-
Data de aceite: dc.date.accessioned2025-08-21T15:21:43Z-
Data de disponibilização: dc.date.available2025-08-21T15:21:43Z-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2012-03-26-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1103/PhysRevB.85.104416-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/226763-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/226763-
Descrição: dc.descriptionMotivated by experiments on nonmagnetic triangular-lattice Mott insulators, we study one candidate paramagnetic phase, namely the columnar dimer (or valence-bond) phase. We apply variants of the bond-operator theory to a dimerized and spatially anisotropic spin-1/2 Heisenberg model and determine its zero-temperature phase diagram and the spectrum of elementary triplet excitations (triplons). Depending on model parameters, we find that the minimum of the triplon energy is located at either a commensurate or an incommensurate wave vector. Condensation of triplons at this commensurate-incommensurate transition defines a quantum Lifshitz point, with effective dimensional reduction that possibly leads to nontrivial paramagnetic (e.g., spin-liquid) states near the closing of the triplet gap. We also discuss the two-particle decay of high-energy triplons, and we comment on the relevance of our results for the organic Mott insulator EtMe 3P[Pd(dmit) 2] 2. © 2012 American Physical Society.-
Descrição: dc.descriptionInstituto de Física Teórica Universidade Estadual Paulista, 01140-070 São Paulo, SP-
Descrição: dc.descriptionInstitut für Theoretische Physik Technische Universität Dresden, 01062 Dresden-
Descrição: dc.descriptionInstituto de Física Teórica Universidade Estadual Paulista, 01140-070 São Paulo, SP-
Idioma: dc.languageen-
Relação: dc.relationPhysical Review B - Condensed Matter and Materials Physics-
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Título: dc.titleTriangular-lattice anisotropic dimerized Heisenberg antiferromagnet: Stability and excitations of the quantum paramagnetic phase-
Tipo de arquivo: dc.typelivro digital-
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