Heisenberg-Kitaev model in a magnetic field: 1/S expansion. CÔNSOLI, Pedro Monteiro; JANSSEN, Lukas; VOJTA, Matthias; ANDRADE, Eric de Castro e.
Abstract: 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 a-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.
Physical Review B
v. 102, n. 15, p. 155134-1-155134-21 - Ano: 2020
Fator de Impacto: 3,575
@article={003009526,author = {CÔNSOLI, Pedro Monteiro; JANSSEN, Lukas; VOJTA, Matthias; ANDRADE, Eric de Castro e.},title={Heisenberg-Kitaev model in a magnetic field: 1/S expansion},journal={Physical Review B},note={v. 102, n. 15, p. 155134-1-155134-21},year={2020}}
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Abstract: 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 a-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.
@article={003009526,author = {CÔNSOLI, Pedro Monteiro; JANSSEN, Lukas; VOJTA, Matthias; ANDRADE, Eric de Castro e.},title={Heisenberg-Kitaev model in a magnetic field: 1/S expansion},journal={Physical Review B},note={v. 102, n. 15, p. 155134-1-155134-21},year={2020}}