Advanced search
Start date
Betweenand
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Author(s):
Consoli, Pedro M. [1, 2, 3] ; Janssen, Lukas [1, 3] ; Vojta, Matthias [1, 3] ; Andrade, Eric C. [2]
Total Authors: 4
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: Physical Review B; v. 102, n. 15 OCT 22 2020.
Web of Science Citations: 0
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: 19/17026-9 - Frustrated magnets: anisotropy and and inhomogeneities
Grantee:Eric de Castro e Andrade
Support type: Regular Research Grants
FAPESP's process: 19/02099-0 - Melting the vortex crystal in the Heisenberg-Kitaev model in a magnetic field
Grantee:Pedro Monteiro Cônsoli
Support type: Scholarships abroad - Research Internship - Master's degree
FAPESP's process: 17/22133-3 - Melting the vortex crystal in the Heisenberg-Kitaev model in a magnetic field
Grantee:Pedro Monteiro Cônsoli
Support type: Scholarships in Brazil - Master