Optical conductivity in the t-J model

被引：23
|
作者：
Plakida, NM
机构：
[1] Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research
来源：
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER | 1997年 / 103卷 / 3-4期
关键词：
D O I：
10.1007/s002570050392
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Frequency dependent conductivity sigma(omega) is calculated for the t - J model by applying the memory function technique in terms of the Hubbard operators. The relaxation rate due to electron scattering on spin and charge dynamical fluctuations is calculated and a generalized Drude law for sigma(omega) is obtained. For a model with an incoherent spectrum for one-hole excitations we obtain a universal form for frequency dependence of relaxation rate and conductivity in terms of the scaling function gamma(omega/kT). The relaxation rate for the t - J model is quite different from that one for the conventional Hubbard model in the strong coupling limit where it vanishes due to an exact cancellation of the intraband scattering and virtual interband transitions.
引用
收藏
页码：383 / 390
页数：8
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