Quantum phase transitions in trimerized zig-zag spin ladders

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dc.creatorRosales, H. D.
dc.creatorCabra, D. C.
dc.creatorGrynberg, M. D.
dc.creatorRossini, G. L.
dc.creatorVekua, T.
dc.date2006-12-12
dc.date2007-04-13
dc.date.accessioned2026-07-07T08:40:18Z
dc.date.available2026-07-07T08:40:18Z
dc.descriptionWe analyze the effects of a trimerized modulation in a quantum spin $S=\frac12$ zig-zag ladder at the magnetization plateau $M=1/3$. Such periodicity is argued to be stemmed from lattice deformations by phonons. The interplay between frustration and exchange modulation is well described by an effective triple sine-Gordon field theory close to the homogeneous ladder and by block-spin perturbation theory in the weakly coupled trimers regime. The characteristic triple degeneracy of the ground state for homogeneous ladders gives place to modulation driven quantum phase transitions, leading to a rich phase diagram including up-up-down, quantum plateau and gapless plateau states.
dc.descriptionNumerical analysis improved, 4 figures added. Final version to appear in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0612271
dc.identifierhttp://arxiv.org/abs/cond-mat/0612271
dc.identifierPhys. Rev. B 75, 174446 (2007)
dc.identifierdoi:10.1103/PhysRevB.75.174446
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/141332
dc.subjectStrongly Correlated Electrons
dc.titleQuantum phase transitions in trimerized zig-zag spin ladders
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