Mean-Field Analysis of Electric Field Effect on Charge Orders in Organic Conductors

Details Mean-Field Analysis of Electric Field Effect on Charge Orders in Organic Conductors Mean-Field Analysis of Electric Field Effect on Charge Orders in Organic Conductors

2008-06-28

arxiv.org/abs/0806.4654v2

Physics

Condensed Matter

Strongly Correlated Electrons

4pages, 6figures, and 1table

Scientific paper

In order to investigate charge ordering phenomena under electric field, static nonequilibrium Hartree approximation (SNHA) method is formulated on the basis of the nonequilibrium Green's functions introduced by Keldysh. By applying the SNHA to the 3/4-filling extended Hubbard model on anisotropic triangular lattice, we study the stabilities and amplitudes of 3-fold and horizontal charge orders in ${\theta}$ and ${\theta}_d$-(BEDT-TTF)$_2X$ salts under the electric field. The obtained results show that the electric field stabilizes the 3-fold state in comparison to the horizontal state. The amplitude of the 3-fold state tends to decrease by the field, whereas that of the horizontal state does not change.

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