GOTFRYD, Dorota, Juraj RUSNAČKO, Krzysztof WOHLFELD, George JACKELI, Jiří CHALOUPKA and Andrzej Michal OLEŚ. Phase diagram and spin correlations of the Kitaev-Heisenberg model: Importance of quantum effects. Physical Review B, College PK, MD USA: AMERICAN PHYSICAL SOCIETY, 2017, vol. 95, No 2, p. "024426-1"-"024426-11". ISSN 2469-9950. doi:10.1103/PhysRevB.95.024426.
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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
Original language English
Type of outcome article in a journal
Field of Study 10302 Condensed matter physics
Country of publisher United States of America
Confidentiality degree is not subject to a state or trade secret
WWW Full Text
Impact factor Impact factor: 3.813
RIV identification code RIV/00216224:14310/17:00094848
Organization unit Faculty of Science
Doi http://dx.doi.org/10.1103/PhysRevB.95.024426
UT WoS 000398728100011
Keywords in English quantum magnetism; spin systems; frustration; spin liquid
Tags NZ, rivok
Tags International impact, Reviewed
Changed by Changed by: Mgr. Marie Šípková, DiS., učo 437722. Changed: 20/1/2020 16:58.
Abstract
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 projectName: Mikroskopické modely magnetismu supravodivých pniktidů železa a vrstevnatých oxidů iridia
LQ1601, research and development projectName: CEITEC 2020 (Acronym: CEITEC2020)
Investor: Ministry of Education, Youth and Sports of the CR, National Feasibility Programme II
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