Nature of the Quantum Phase Transition in Quantum Compass Model

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dc.creatorChen, Han-Dong
dc.creatorFang, Chen
dc.creatorHu, Jiangping
dc.creatorYao, Hong
dc.date2006-12-07
dc.date.accessioned2026-07-07T07:54:43Z
dc.date.available2026-07-07T07:54:43Z
dc.descriptionIn this work, we show that the quantum compass model on an square lattice can be mapped to a fermionic model with local density interaction. We introduce a mean-field approximation where the most important fluctuations, those perpendicular to the ordering direction, are taken into account exactly. It is found that the quantum phase transition point at $J_x=J_z$ marks a first order phase transition. We also show that the mean field result is robust against the remaining fluctuation corrections up to the second order.
dc.description7 pages, 10 figs
dc.identifierhttps://arxiv.org/abs/cond-mat/0612195
dc.identifierhttp://arxiv.org/abs/cond-mat/0612195
dc.identifierPhys Rev B 75, 144401 (2007)
dc.identifierdoi:10.1103/PhysRevB.75.144401
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/126719
dc.subjectStrongly Correlated Electrons
dc.titleNature of the Quantum Phase Transition in Quantum Compass Model
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