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
N1 - Funding Information:
The authors are grateful to S. Iwai for showing his data prior to publication and enlightening discussions. This work was supported by Grants-in-Aid and “Grand Challenges in Next-Generation Integrated Nanoscience” from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
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
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U2 - 10.1016/j.physb.2009.11.105
DO - 10.1016/j.physb.2009.11.105
M3 - Article
AN - SCOPUS:84859891896
SN - 0921-4526
VL - 405
SP - S369-S372
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
IS - 11 SUPPL.
ER -