Spin gap and string order parameter in the ferromagnetic Spiral Staircase Heisenberg Ladder: a quantum Monte Carlo study

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dc.creatorBrünger, C.
dc.creatorAssaad, F. F.
dc.creatorCapponi, S.
dc.creatorAlet, F.
dc.creatorAristov, D. N.
dc.creatorKiselev, M. N.
dc.date2007-06-19
dc.date2007-06-25
dc.date.accessioned2026-07-07T09:38:55Z
dc.date.available2026-07-07T09:38:55Z
dc.descriptionWe consider a spin-1/2 ladder with a ferromagnetic rung coupling J_\perp and inequivalent chains. This model is obtained by a twist (θ) deformation of the ladder and interpolates between the isotropic ladder (θ=0) and the SU(2) ferromagnetic Kondo necklace model (θ=π). We show that the ground state in the (θ,J_\perp) plane has a finite string order parameter characterising the Haldane phase. Twisting the chain introduces a new energy scale, which we interpret in terms of a Suhl-Nakamura interaction. As a consequence we observe a crossover in the scaling of the spin gap at weak coupling from Δ/J_\| \propto J_\perp/J_\| for θ< θ_c \simeq 8π/9 to Δ/J_\| \propto (J_\perp/J_\|)^2 for θ> θ_c. Those results are obtained on the basis of large scale Quantum Monte Carlo calculations.
dc.description4 pages
dc.identifierhttps://arxiv.org/abs/0706.2769
dc.identifierhttp://arxiv.org/abs/0706.2769
dc.identifierPhys. Rev. Lett. 100, 017202 (2008)
dc.identifierdoi:10.1103/PhysRevLett.100.017202
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/160986
dc.subjectStrongly Correlated Electrons
dc.titleSpin gap and string order parameter in the ferromagnetic Spiral Staircase Heisenberg Ladder: a quantum Monte Carlo study
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