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Bibliographic description

punktacja MNiSW [2015 A]: 15 

title:	Frustration and entanglement in compass and spin-orbital models
author:	Oleś Andrzej
journal title:	Acta Physica Polonica. A
title of volume:	Proceedings of the European Conference Physics of Magnetism 2014 (PM'14) Poznań, Poland, June 23-27, 2014
volume:	127
issue:	2
date of publication :	2015
pages:	163-169
ISSN:	0587-4246
eISSN:	1898-794X
DOI:	10.12693/APhysPolA.127.163
language:	English
journal language:	English
abstract in English:	We review the consequences of intrinsic frustration of the orbital superexchange and of spin-orbital entanglement. While the Heisenberg perturbing interactions remove frustration in the compass model, the lowest columnar excitations are robust in the nanoscopic compass clusters and might be used for quantum computations. Entangled spin-orbital states determine the ground states in some cases, while in others concern excited states and lead to measurable consequences, as in the RVO_{3} perovskites. On-site entanglement for strong spin-orbit coupling generates the frustrated Kitaev-Heisenberg model with a rich magnetic phase diagram on the honeycomb lattice. Frustration is here reflected in hole propagation which changes from coherent in an antiferromagnet via hidden quasiparticles in zigzag and stripe phases to entirely incoherent one in the Kitaev spin liquid.
number of pulisher's sheets:	0,5
affiliation:	Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
type:	journal article
subtype:	academic paper

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