Charge-Ordered State versus Dimer-Mott Insulator at Finite Temperatures

Details Charge-Ordered State versus Dimer-Mott Insulator at Finite Temperatures Charge-Ordered State versus Dimer-Mott Insulator at Finite Temperatures

2007-08-07

arxiv.org/abs/0708.0910v1

J. Phys. Soc. Jpn. 76, 103701 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, to be published in J. Phys. Soc. Jpn. Vol.76 No.10

Scientific paper

10.1143/JPSJ.76.103701

We theoretically investigate the competition between charge-ordered state and Mott insulating state at finite temperatures in quarter-filled quasi-one-dimensional electron systems, by studying dimerized extended Hubbard chains with interchain Coulomb interactions. In order to take into account one-dimensional fluctuations properly, we apply the bosonization method to an effective model obtained by the interchain mean-field approximation. The results show that lattice dimerization, especially in the critical region, and frustration in the interchain Coulomb interactions reduce the charge-ordering phase transition temperature and enlarge the dimer-Mott insulating phase. We also derive a general formula of the Knight shift in the charge-ordered phase and its implication to experiments is discussed.

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