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@article{1385982,
author = {Gotfryd, Dorota and Rusnačko, Juraj and Wohlfeld, Krzysztof and Jackeli, George and Chaloupka, Jiří and Oleś, Andrzej Michal},
article_location = {College PK, MD USA},
article_number = {2},
doi = {http://dx.doi.org/10.1103/PhysRevB.95.024426},
keywords = {quantum magnetism; spin systems; frustration; spin liquid},
language = {eng},
issn = {2469-9950},
journal = {Physical Review B},
title = {Phase diagram and spin correlations of the Kitaev-Heisenberg model: Importance of quantum effects},
url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.95.024426},
volume = {95},
year = {2017}
}
TY - JOUR
ID - 1385982
AU - Gotfryd, Dorota - Rusnačko, Juraj - Wohlfeld, Krzysztof - Jackeli, George - Chaloupka, Jiří - Oleś, Andrzej Michal
PY - 2017
TI - Phase diagram and spin correlations of the Kitaev-Heisenberg model: Importance of quantum effects
JF - Physical Review B
VL - 95
IS - 2
SP - "024426-1"-"024426-11"
EP - "024426-1"-"024426-11"
PB - AMERICAN PHYSICAL SOCIETY
SN - 24699950
KW - quantum magnetism
KW - spin systems
KW - frustration
KW - spin liquid
UR - https://journals.aps.org/prb/abstract/10.1103/PhysRevB.95.024426
L2 - https://journals.aps.org/prb/abstract/10.1103/PhysRevB.95.024426
N2 - 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.
ER -
GOTFRYD, Dorota, Juraj RUSNAČKO, Krzysztof WOHLFELD, George JACKELI, Jiří CHALOUPKA and Andrzej Michal OLE$\backslash$'S. Phase diagram and spin correlations of the Kitaev-Heisenberg model: Importance of quantum effects. \textit{Physical Review B}. College PK, MD USA: AMERICAN PHYSICAL SOCIETY, vol.~95, No~2, p.~''024426-1''-''024426-11'', 11 pp. ISSN~2469-9950. doi:10.1103/PhysRevB.95.024426. 2017.
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