微波电场下的热电子温差电势率

HOT ELECTRON THERMOELECTRIC POWER UNDER A MICROWAVE FIELD

局域微波场的作用会在半导体样品中产生热电子的温度和化学势的梯度.本文推广运用非平衡统计算子的理论方法计算存在温度和化学势梯度的热电子系统的输运系数,得到了热电子质心动量和能量的平衡方程,导出了热电子温差电势率和热导率的表达式.数值计算表明,理论结果与微波场作用下的温差电动势随电场平均功率的实验测量值可以定量比较.

Gradient of temperature and chemical potential can be produced in a semiconductor sample by applying a localized microwave field. The nonequilibrium statistical opertor method is generalized and applied to study the transport coefficients of a hot-electron system with temperature and chemical-potential gradients. The balance equations for center-of-mass momentum and energy of hot electrons are derived, and the expressions of thermoelectric power and thermal conductivity of hot electrons are obtained. The theoretical results from numerical calculation are compared quantitatively with the experimental data of thermoelectric power under a microwave field.