Multistable natures and photo-induced charge-separation in hole-doped states of strongly coupled electron-phonon systems

被引:0
作者
Hitoshi, N [1 ]
Masato, S [1 ]
Takeshi, I [1 ]
机构
[1] Osaka City Univ, Dept Phys, Grad Sch Sci, Sumiyoshi Ku, Osaka 5588585, Japan
来源
INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2001年 / 15卷 / 28-30期
关键词
hole doping; multistability; charge separation;
D O I
10.1142/S0217979201008962
中图分类号
O59 [应用物理学];
学科分类号
摘要
We investigate the effects of hole doping in the charge-density wave (CDW) state that has the strong electron-phonon. (e-p) coupling, using the two-dimensional molecular crystal model. In calculations, we use the mean-filed theory for the interelectronic interactions and the adiabatic approximation for phonons. On the basis of this theory, we calculate e-p states of doped ground states for various values of the doping concentration of holes. From the calculated results, it is found that a multistable nature appears in the doped e-p states just before the CDW-metal phase transition. In order to see the effects of the photoexcitation in the hole-doped states, we also investigate the exciton states taking into account the electron-hole correlation. Results calculated here indicate that the separation of electron and hole occurs in the photoexcited states as a consequence of the energy relaxation of excitons.
引用
收藏
页码:3904 / 3907
页数:4
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