THE STAGGERED CHARGE-ORDER PHASE OF THE EXTENDED HUBBARD MODEL

Details THE STAGGERED CHARGE-ORDER PHASE OF THE EXTENDED HUBBARD MODEL THE STAGGERED CHARGE-ORDER PHASE OF THE EXTENDED HUBBARD MODEL

1995-01-20

arxiv.org/abs/cond-mat/9501097v1

Physics

Condensed Matter

19 pages, ams-tex, 2 Postscriptfigures

Scientific paper

10.1088/0305-4470/29/4/005

We study the phase diagram of the extended Hubbard model in the atomic limit. At zero temperature, the phase diagram decomposes into six regions: three with homogeneous phases (characterized by particle densities $\rho=0$, 1, and 2 and staggered charge density $\Delta=0$) and three with staggered phases (characterized by the densities $\rho=\frac12$, 1, and $\frac32$ and staggered densities $|\Delta|=\frac12$, 1, and $\frac12$). Here we use Pirogov-Sinai theory to analyze the details of the phase diagram of this model at low temperatures. In particular, we show that for any sufficiently low nonzero temperature the three staggered regions merge into one staggered region $S$, without any phase transitions (analytic free energy and staggered order parameter $\Delta$) within $S$.

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