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|Date and time:||4th February (Tue.) 16:00〜|
|Place:||SPring-8, "HOUKOUKAN" seminar room|
|Title:||Long-period charge fluctuation in molecular θ-(BEDT-TTF)2X|
|講演者:||妹尾仁嗣 氏 （理研）|
|Speaker:||Dr. Hitoshi Seo (RIKEN)|
We theoretically study the role of charge fluctuation in a molecular family θ-(BEDT-TTF)2X, which situates just on the verge of the charge order phase.
In the compounds which is just near the phase boundary, exotic behaviors such as highly non-linear conduction  and charge-cluster glass state  are observed.
In this system, existence of geometrical frustration in the charge arrangement has been pointed out , while long-period charge fluctuation is often observed by x-ray scattering technique.
Here we numerically investigate interacting fermion models on the anisotropic triangular lattice especially focusing on the role of long-range Coulomb repulsion beyond nearest-neighbors .
We find that it stabilizes the long-period charge order/fluctuating state over the previously-known commensurate charge ordered states.
Implications to the experiments will be discussed.
 F. Sawano et al, Nature 437 (2005) 522.
 F. Kagawa et al, Nature Physics 9 (2013) 419.
 J. Merino, H. Seo, M. Ogata, Phys. Rev. B 71 (2005) 125111; H. Seo, K. Tsutsui, M. Ogata, and J. Merino, J. Phys. Soc. Jpn. 75 (2006) 114707.
 M. Naka and H. Seo, in preparation.