| Full text | |
| Author(s): |
Consoli, Pedro M.
;
Janssen, Lukas
;
Vojta, Matthias
;
Andrade, Eric C.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW B; v. 102, n. 15, p. 21-pg., 2020-10-22. |
| 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 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) | |
| FAPESP's process: | 19/02099-0 - Melting the vortex crystal in the Heisenberg-Kitaev model in a magnetic field |
| Grantee: | Pedro Monteiro Cônsoli |
| Support Opportunities: | Scholarships abroad - Research Internship - Master's degree |
| FAPESP's process: | 19/17026-9 - Frustrated magnets: anisotropy and and inhomogeneities |
| Grantee: | Eric de Castro e Andrade |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 17/22133-3 - Melting the vortex crystal in the Heisenberg-Kitaev model in a magnetic field |
| Grantee: | Pedro Monteiro Cônsoli |
| Support Opportunities: | Scholarships in Brazil - Master |