### Abstract

Quasi-two-dimensional organic conductors θ-(BEDT-TTF) _{2}RbZn(SCN)_{4} and -(BEDT-TTF)_{2}I_{3} [BEDT-TTF= bis(ethylenedithio)tetrathiafulvalene] are known to have quite similar charge-ordered ground states with so-called horizontal stripes. Their photoinduced dynamics toward conductive states are quite different and their mechanisms are theoretically studied by numerical solutions to the time-dependent Schrödinger equation for the exact many-electron wave functions coupled with classical phonons in extended Peierls-Hubbard models on anisotropic triangular lattices. The θ-type salt has a highly symmetric crystal structure and its triangular lattice induces charge frustration, which is relieved by molecular rotations in the charge-ordered state. The lattice effect is thus strong and the large lattice stabilization energy makes the charge order hard, compared with that in the α-type salt. The different structural symmetries are reflected in their photoinduced evolutions of ground-state populations and charge distributions.

Original language | English |
---|---|

Journal | Physica B: Condensed Matter |

Volume | 405 |

Issue number | 11 SUPPL. |

DOIs | |

Publication status | Published - 2010 Jun 1 |

Externally published | Yes |

### Fingerprint

### Keywords

- Charge order
- Electron-lattice coupling
- Metal-insulator transition
- Photoinduced phase transition

### ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering

### Cite this

*Physica B: Condensed Matter*,

*405*(11 SUPPL.). https://doi.org/10.1016/j.physb.2009.11.105

**Frustration and lattice effects on photoinduced melting of charge orders in quasi-two-dimensional organic conductors.** / Yonemitsu, Kenji; Miyashita, Satoshi; Tanaka, Yasuhiro.

Research output: Contribution to journal › Article

*Physica B: Condensed Matter*, vol. 405, no. 11 SUPPL.. https://doi.org/10.1016/j.physb.2009.11.105

}

TY - JOUR

T1 - Frustration and lattice effects on photoinduced melting of charge orders in quasi-two-dimensional organic conductors

AU - Yonemitsu, Kenji

AU - Miyashita, Satoshi

AU - Tanaka, Yasuhiro

PY - 2010/6/1

Y1 - 2010/6/1

N2 - Quasi-two-dimensional organic conductors θ-(BEDT-TTF) 2RbZn(SCN)4 and -(BEDT-TTF)2I3 [BEDT-TTF= bis(ethylenedithio)tetrathiafulvalene] are known to have quite similar charge-ordered ground states with so-called horizontal stripes. Their photoinduced dynamics toward conductive states are quite different and their mechanisms are theoretically studied by numerical solutions to the time-dependent Schrödinger equation for the exact many-electron wave functions coupled with classical phonons in extended Peierls-Hubbard models on anisotropic triangular lattices. The θ-type salt has a highly symmetric crystal structure and its triangular lattice induces charge frustration, which is relieved by molecular rotations in the charge-ordered state. The lattice effect is thus strong and the large lattice stabilization energy makes the charge order hard, compared with that in the α-type salt. The different structural symmetries are reflected in their photoinduced evolutions of ground-state populations and charge distributions.

AB - Quasi-two-dimensional organic conductors θ-(BEDT-TTF) 2RbZn(SCN)4 and -(BEDT-TTF)2I3 [BEDT-TTF= bis(ethylenedithio)tetrathiafulvalene] are known to have quite similar charge-ordered ground states with so-called horizontal stripes. Their photoinduced dynamics toward conductive states are quite different and their mechanisms are theoretically studied by numerical solutions to the time-dependent Schrödinger equation for the exact many-electron wave functions coupled with classical phonons in extended Peierls-Hubbard models on anisotropic triangular lattices. The θ-type salt has a highly symmetric crystal structure and its triangular lattice induces charge frustration, which is relieved by molecular rotations in the charge-ordered state. The lattice effect is thus strong and the large lattice stabilization energy makes the charge order hard, compared with that in the α-type salt. The different structural symmetries are reflected in their photoinduced evolutions of ground-state populations and charge distributions.

KW - Charge order

KW - Electron-lattice coupling

KW - Metal-insulator transition

KW - Photoinduced phase transition

UR - http://www.scopus.com/inward/record.url?scp=84859891896&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84859891896&partnerID=8YFLogxK

U2 - 10.1016/j.physb.2009.11.105

DO - 10.1016/j.physb.2009.11.105

M3 - Article

AN - SCOPUS:84859891896

VL - 405

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

SN - 0921-4526

IS - 11 SUPPL.

ER -