层中的热场论：热场论方法在二维电子片中光子传播中的应用
Thermal Field Theory in a layer: Applications of Thermal Field Theory methods to the propagation of photons in a two-dimensional electron sheet
摘要：
本文应用热场论方法研究了光子在等离子体层中的传播。等离子体层是指电子被限制在二维平面薄片中的等离子体。我们计算了光子的自能，确定了光子在这种介质中传播的表达式，并由此得到了光子传播模的性质。对于带电粒子气体热分布的一些简单情况，详细地导出了光子色散关系和偏振矢量的计算公式，并给出了适用于更一般情况的相应公式。
英文摘要：
We apply the Thermal Field Theory methods to study the propagation of photons in a plasma layer, that is a plasma in which the electrons are confined to a two-dimensional plane sheet. We calculate the photon self-energy and determine the appropriate expression for the photon propagator in such a medium, from which the properties of the propagating modes are obtained. The formulas for the photon dispersion relations and polarization vectors are derived explicitly in some detail for some simple cases of the thermal distributions of the charged particle gas, and appropriate formulas that are applicable in more general situations are also given.
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