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本文利用密度矩阵方法研究了柱形量子线中的光学克尔效应,重点讨论了电子-声子相互作用对其的影响,并以GaAs量子线为例进行了数值计算。结果显示,随着量子线半径R0的减小,光学克尔效应会逐渐增强;考虑了电子-声子相互作用时的光学克尔效应比未考虑电子-声子相互作用时的大20%多;量子线半径R0越小,峰越尖锐,峰值越强;当量子线半径R0大于40nm时,峰会逐渐消失.
In this paper, the optical Kerr effect in a cylindrical quantum wire is studied by means of the density matrix method, and the effect of the electron-phonon interaction is discussed. The GaAs quantum wire is taken as an example for numerical calculation. The results show that the optical Kerr effect will gradually increase as the quantum wire radius R0 decreases. The optical Kerr effect when the electron-phonon interaction is considered is more than 20% larger than that without considering the electron-phonon interaction ; The smaller the quantum wire radius R0, the sharper the peak, the stronger the peak; when the quantum wire radius R0 is greater than 40nm, the summit disappears gradually.