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
Pages (from-to)S369-S372
JournalPhysica B: Condensed Matter
Volume405
Issue number11 SUPPL.
DOIs
Publication statusPublished - 2010 Jun 1
Externally publishedYes

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

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