J 2017

Phase diagram and spin correlations of the Kitaev-Heisenberg model: Importance of quantum effects

GOTFRYD, Dorota, Juraj RUSNAČKO, Krzysztof WOHLFELD, George JACKELI, Jiří CHALOUPKA et. al.

Basic information

Original name

Phase diagram and spin correlations of the Kitaev-Heisenberg model: Importance of quantum effects

Authors

GOTFRYD, Dorota (616 Poland), Juraj RUSNAČKO (703 Slovakia, belonging to the institution), Krzysztof WOHLFELD (616 Poland), George JACKELI (268 Georgia), Jiří CHALOUPKA (203 Czech Republic, guarantor, belonging to the institution) and Andrzej Michal OLEŚ (616 Poland)

Edition

Physical Review B, College PK, MD USA, AMERICAN PHYSICAL SOCIETY, 2017, 2469-9950

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10302 Condensed matter physics

Country of publisher

United States of America

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 3.813

RIV identification code

RIV/00216224:14310/17:00094848

Organization unit

Faculty of Science

DOI

UT WoS

000398728100011

Keywords in English

quantum magnetism; spin systems; frustration; spin liquid

Tags

Tags

International impact, Reviewed
Změněno: 20/1/2020 16:58, Mgr. Marie Šípková, DiS.

Abstract

V originále

We explore the phase diagram of the Kitaev-Heisenberg model with nearest neighbor interactions on the honeycomb lattice using the exact diagonalization of finite systems combined with the cluster mean field approximation, and supplemented by the insights from analytic approaches: the linear spin-wave and second-order perturbation theories. This study confirms that by varying the balance between the Heisenberg and Kitaev term, frustrated exchange interactions stabilize in this model either one of four phases with magnetic long range order: Neel phase, ferromagnetic phase, and two other phases with coexisting antiferromagnetic and ferromagnetic bonds, zigzag and stripy phase, or one of two distinct spin-liquid phases. Out of these latter disordered phases, the one with ferromagnetic Kitaev interactions has a substantially broader range of stability as the neighboring competing ordered phases, ferromagnetic and stripy, have very weak quantum fluctuations. Focusing on the quantum spin-liquid phases, we study spatial spin correlations and dynamic spin structure factor of the model by the exact diagonalization technique, and discuss the evolution of gapped low-energy spin response across the quantum phase transitions between the disordered spin liquid and phases with long range magnetic order.

Links

GJ15-14523Y, research and development project
Name: Mikroskopické modely magnetismu supravodivých pniktidů železa a vrstevnatých oxidů iridia
LQ1601, research and development project
Name: CEITEC 2020 (Acronym: CEITEC2020)
Investor: Ministry of Education, Youth and Sports of the CR