Finite-temperature investigation of quarter filled ladder systems
arXiv:cond-mat/0406715 · doi:10.1016/j.physb.2005.01.436
Abstract
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.
arXiv comment2 pages, 4 eps-figures, submitted to SCES04
References in corpus (5)
- NaV_2O_5 as a quarter-filled ladder compound
- Phase diagram of the quarter-filled extended Hubbard model on a two-leg ladder
- Charge Density Waves and Bond Order Waves in a quarter filled extended Hubbard ladder
- Charge ordering in quarter-filled ladder systems coupled to the lattice
- Optical properties and Raman scattering of vanadium ladder compounds