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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Heisenberg-Kitaev model in a magnetic field: 1/S expansion

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Autor(es):
Consoli, Pedro M. [1, 2, 3] ; Janssen, Lukas [1, 3] ; Vojta, Matthias [1, 3] ; Andrade, Eric C. [2]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden - Germany
[2] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13560970 Sao Carlos, SP - Brazil
[3] Tech Univ Dresden, Wurzburg Dresden Cluster Excellence Ctqmat, D-01062 Dresden - Germany
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Physical Review B; v. 102, n. 15 OCT 22 2020.
Citações Web of Science: 0
Resumo

The exact solution of Kitaev's spin-1/2 honeycomb spin-liquid model has sparked an intense search for Mott insulators hosting bond-dependent Kitaev interactions, of which Na2IrO3 and alpha-RuCl3 are prime examples. Subsequently, it has been proposed that also spin-1 and spin-3/2 analogs of Kitaev interactions may occur in materials with strong spin-orbit coupling. As a minimal model to describe these Kitaev materials, we study the Heisenberg-Kitaev Hamiltonian in a consistent 1/S expansion, with S being the spin size. We present a comprehensive study of this model in the presence of an external magnetic field applied along two different directions, {[}001] and {[}111], for which an intricate classical phase diagram has been reported. In both settings, we employ spin-wave theory in a number of ordered phases to compute phase boundaries at the next-to-leading order in 1/S and show that quantum corrections substantially modify the classical phase diagram. More broadly, our work presents a consistent route to investigate the leading quantum corrections in spin models that break spin-rotational symmetry. (AU)

Processo FAPESP: 19/17026-9 - Magnetos frustrados: anisotropia e inomogeneidades
Beneficiário:Eric de Castro e Andrade
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 19/02099-0 - Derretendo o cristal de vórtices no modelo de Heisenberg-Kitaev em um campo magnético
Beneficiário:Pedro Monteiro Cônsoli
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Mestrado
Processo FAPESP: 17/22133-3 - Derretendo o cristal de vórtices no modelo de Heisenberg-Kitaev em um campo magnético
Beneficiário:Pedro Monteiro Cônsoli
Linha de fomento: Bolsas no Brasil - Mestrado