电场对量子阱中自由载流子光辐射线宽的影响

Effect of Electric Field on Optical Radiation Linewidth of Free carriers in Quantum Wells

本文对固体中在较大空间范围运动的粒子采用轨道、动量及波包来描述。根据量子力学测不准关系， 粒子的能量测不准公式被导出。公式表明， 电场强烈地散射载流子， 使载流子所处能级大为展宽。应用该公式到Ｐ－Ｉ－Ｎ结构的ＧａＡｓ／ＧａＡｌＡｓ 多量子阱中， 理论计算的光辐射线宽与光致荧光实验测得的线宽吻合。

By using concepts as orbit,momentum and wave packet,the particles which move in a large range of space in solid state are described.According to the uncertainty relations in quantum mechanics,a formula of energy uncertainty of particles is derived.The formula indicates that electric field scatters carriers strongly and makes energy levels broaden largely.Applying the formula to GaAs/GaAlAs quantum wells with P I N structure,the calculated optical radiation linewidths are in agreement with measured photoluminescence linewidths.