Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-06-29
Physica B359, 1400 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
2 pages, 4 eps-figures, submitted to SCES04
Scientific paper
10.1016/j.physb.2005.01.436
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(\mu) dependence at large nearest neighbor Coulomb repulsion.
Aichhorn Markus
Evertz Hans Gerd
Gabriel Carlos
Lang Thomas C.
Sherman Edward
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