The Effect of Exchange-Correlation Holes on the Temperature Dependent Dynamic Dielectric Function of Single-Layer Quantum Wells and Coupled Nanolayers

Journal of Nanostructures

V. Rafee¹  S. A. Hashemizadeh¹ 

[1] Physics Department, faculty of science, Payame Noor University, Po box 19395-3697 Tehran, Iran;

关键词: Temperature-dependent;    Dielectric Function;    Double;    Nanolayer;    Exchange-Correlation;    Hubbard Approximation;   

DOI  :  10.7508/jns.2013.04.005

来源: DOAJ

【 摘 要 】

In this paper, for the first time we have studied theoretically the effect of exchange-correlation holes around electrons in GaAlAs/GaAs/GaAlAs nanostructure on the temperature-dependent dynamic dielectric function of two-dimensional electron gas by employing random phase, STLS and Hubbard approximations. Also, we have investigated another interesting system which is coupled quantum wells structure. To make a good comparison and show the effect of local field, the numerical results have been compared with those obtained within RPA which considers long-range interactions and ignores exchange-correlation effects completely. We found that taking into account the exchange-correlation effects changes considerably the values of dynamic dielectric function at low electron densities at finite temperatures.

【 授权许可】

Unknown