Charge fluctuation in A3C60 (A=K and Rb):: Competition between electron-electron and electron-phonon interactions

被引:6
作者
Chida, T [1 ]
Suzuki, S [1 ]
Nakao, K [1 ]
机构
[1] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan
关键词
alkali-metal-doped C-60; charge fluctuation; spectral density; photoemission spectrum; satellite; electron-electron interaction; electron-phonon interaction;
D O I
10.1143/JPSJ.70.317
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We show that charge fluctuation occurs in A(3)C(60) due to the competition between electron-electron and electron-phonon interactions and consequently the material remains metallic although both interactions are considerably strong. We calculate the spectral density for A(3)C(60) based on the dynamical mean-field theory by using the exact diagonalization method. We find a satellite, which is a direct consequence of the charge fluctuation, at about 1.3 eV below the Fermi level. We point out that high-resolution photoemission experiments have shown the existence of this satellite.
引用
收藏
页码:317 / 320
页数:4
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