抛物柱形量子点中电子拉曼散射的研究(英文)

Electron Raman scattering in parabolic cylindrical quantum dots

以GaAs材料为例,利用有效质量近似和微扰理论研究了抛物柱形量子点中的电子拉曼散射.考虑电子完全限制在量子点内,导带和价带为分立的抛物形能带.研究了跃迁的选择定则.计算结果表明,微分散射截面是散射频率、柱面半径和量子点本征频率的函数.确定并解释了散射谱的最大值.由于量子受限效应,散射谱的最大值随着限制势频率的增大而增大.

Using the approximation of effective masses and the perturbation theory,electron Raman scattering is investigated in the cylindrical GaAs quantum dot(QD) of parabolic confinement potential.The differential cross section(DCS) involved in this process is calculated as a function of the scattering frequency,the frequency of the QDs confinement potential and the radius of the cylinder.Singularities of the spectra are found and interpreted.The singularities become larger when the frequency of confinement potenti...