Finite-temperature investigation of quarter filled ladder systems

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We investigate charge ordering in a quarter-filled ladder at finite temperature by determinantal Quantum Monte Carlo. The sign problem is moderate in a wide range of model parameters relevant for NaV2O5. The charge order parameter exhibits a crossover as a function of inverse temperature on finite systems. Above a critical nearest neighbor Coulomb repulsion, the correlation length grows exponentially with inverse temperature, indicative of the ordered phase at T=0. We find a clear single-particle gap manifesting itself in a flat n(μ) dependence at large nearest neighbor Coulomb repulsion.
2 pages, 4 eps-figures, submitted to SCES04

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/24303

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0406715
 http://arxiv.org/abs/cond-mat/0406715
 Physica B359, 1400 (2005)
 doi:10.1016/j.physb.2005.01.436

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arXiv