Abstract
We theoretically discuss the mechanism for the peculiar nonlinear conduction in quasi-two-dimensional organic conductors θ-(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.
Original language | English |
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Article number | 103702 |
Journal | journal of the physical society of japan |
Volume | 80 |
Issue number | 10 |
DOIs | |
Publication status | Published - 2011 Oct |
Externally published | Yes |
Keywords
- Charge order
- Nonequilibrium Green's function
- Nonlinear conduction
- Organic conductor
ASJC Scopus subject areas
- Physics and Astronomy(all)