Nonlinear conduction by melting of stripe-type charge order in organic conductors with triangular lattices

Yasuhiro Tanaka; Kenji Yonemitsu

doi:10.1143/JPSJ.80.103702

Nonlinear conduction by melting of stripe-type charge order in organic conductors with triangular lattices

Yasuhiro Tanaka, Kenji Yonemitsu

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

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
Article number	103702
Journal	journal of the physical society of japan
Volume	80
Issue number	10
DOIs	https://doi.org/10.1143/JPSJ.80.103702
Publication status	Published - 2011 Oct

Keywords

Charge order
Nonequilibrium Green's function
Nonlinear conduction
Organic conductor

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJ.80.103702

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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.",

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AU - Tanaka, Yasuhiro

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AB - 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.

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