局域场修正对有限温度耦合量子层系统中准粒子非弹性散射率的影响
Local field correction effects on quasi-particle inelastic scattering rate in a coupled-quantum-layers system at finite temperature
摘要：
研究了有限温度下耦合量子阱结构中局域场修正对相互作用电子层内非弹性散射率的影响。首先，采用无规相位近似（RPA）计算了温度相关的动态介电函数。然后，在计算中考虑了局域场修正效应，采用了电子周围的交换关联空穴的短程效应。我们采用哈伯德，有限温度哈伯德和STLS近似。最后，利用GW方法中的电子自能虚部计算了准粒子非弹性散射率。结果表明，在任意温度、波矢和电子密度下，采用局域场修正后，准粒子非弹性散射率都有所降低。
英文摘要：
Local field correction effects on intra-layer inelastic scattering rate of interacting electrons are theoretically investigated in a coupled-quantum-wells structure, at finite temperature. At first, temperature dependent dynamic dielectric function is calculated using random phase approximation (RPA). Then, local field correction effects are considered in calculations by employing short-range effects of exchange-correlation holes around electrons. We employ Hubbard, finite-temperature Hubbard and STLS approximations. Finally, quasi-particle inelastic scattering rate is calculated using the imaginary part of the electron self-energy within GW method. The results show that quasi-particle inelastic scattering rate is reduced, when a local field correction is employed, at any temperature, wave vector and electron density.
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