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Melting the vortex crystal in the Heisenberg-Kitaev model in a magnetic field

Grant number: 19/02099-0
Support type:Scholarships abroad - Research Internship - Master's degree
Effective date (Start): September 30, 2019
Effective date (End): March 20, 2020
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Eric de Castro e Andrade
Grantee:Pedro Monteiro Cônsoli
Supervisor abroad: Matthias Vojta
Home Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Local de pesquisa : Technische Universität Dresden (TU Dresden), Germany  
Associated to the scholarship:17/22133-3 - Melting the vortex crystal in the Heisenberg-Kitaev model in a magnetic field, BP.MS

Abstract

We will investigate in this project exotic phases of matter which emerge due tothe combination of strong spin-orbit coupling and electronic correlations, giving raisethe so-called spin-orbit Mott insulators. As systems of interest, we have in mindthe materials alpha-RuCl3 and A2IrO3 (A=Na, Li), which are well described by theHeisenberg-Kitaev model. In particular, we focus on the alpha-RuCl3, a compoundthat presents strong evidence of a spin liquid phase in the presence of an externalmagnetic field. We want to investigate how some of the unusual magnetic phasesencountered in the classical limit of the Heisenberg-Kitaev model, such as a vortexcrystal, are destroyed in the presence of quantum fluctuations. We will study thismodel using spin-wave theory and we want to consistently obtain the phase diagramup to order 1/S. Because the phases in the model are non-collinear, one has to takeinto account cubic terms in the magnon Hamiltonian for a consistent 1/S expansion,thus rendering the calculations rather challenging.

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
GASS, S.; CONSOLI, P. M.; KOCSIS, V; CORREDOR, L. T.; LAMPEN-KELLEY, P.; MANDRUS, D. G.; NAGLER, S. E.; JANSSEN, L.; VOJTA, M.; BUECHNER, B.; WOLTER, A. U. B. Field-induced transitions in the Kitaev material alpha-RuCl3 probed by thermal expansion and magnetostriction. Physical Review B, v. 101, n. 24 JUN 25 2020. Web of Science Citations: 0.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.