Nonlinear Conduction by Melting of Stripe-Type Charge Order in Organic Conductors with Triangular Lattices
Abstract
We theoretically discuss the mechanism for the peculiar nonlinear conduction in quasi-two-dimensional organic conductors \theta-(BEDT-TTF)2X [BEDT-TTF=bis(ethylenedithio)tetrathiafulvalene] through the melting of stripe-type charge order. An extended Peierls-Hubbard model attached to metallic electrodes is investigated by a nonequilibrium Green's function technique. A novel current-voltage characteristic appears in a coexistent state of stripe-type and nonstripe 3-fold charge orders, where the applied bias melts mainly the stripe-type charge order through the reduction of lattice distortion, whereas the 3-fold charge order survives. These contrastive responses of the two different charge orders are consistent with the experimental observations.
Keywords
Cite
@article{arxiv.1108.6115,
title = {Nonlinear Conduction by Melting of Stripe-Type Charge Order in Organic Conductors with Triangular Lattices},
author = {Yasuhiro Tanaka and Kenji Yonemitsu},
journal= {arXiv preprint arXiv:1108.6115},
year = {2011}
}
Comments
5 pages, 4 figures, to appear in J. Phys. Soc. Jpn