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

Kenji Yonemitsu, Satoshi Miyashita, Yasuhiro Tanaka

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
JournalPhysica B: Condensed Matter
Volume405
Issue number11 SUPPL.
DOIs
Publication statusPublished - 2010 Jun 1
Externally publishedYes

Fingerprint

Organic conductors
frustration
Ground state
Melting
conductors
melting
Salts
Population distribution
Hubbard model
Charge distribution
Crystal symmetry
Phonons
Wave functions
Crystal lattices
Stabilization
Crystal structure
salts
molecular rotation
ground state
Electrons

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

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

In: Physica B: Condensed Matter, Vol. 405, No. 11 SUPPL., 01.06.2010.

Research output: Contribution to journalArticle

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