摘要
给出了具有椭球边界量子棒经过坐标变换成球形边界的哈密顿量。采用线性组合算符和幺正变换的方法研究了在非均匀抛物限制势下量子棒中强耦合磁极化子的性质。导出了量子棒中强耦合磁极化子的振动频率和声子平均数随磁场的回旋频率、电子-声子耦合强度、椭球的纵横比和横向和纵向有效受限长度的变化关系。结果表明:振动频率和声子平均数随电子-声子耦合强度和磁场的回旋频率的增加而增加,随横向和纵向有效受限长度的减小而迅速增大。当e′>1时,振动频率和声子平均数随椭球的纵横比增加而增加。e′<1时,随着椭球的纵横比减少,振动频率和声子平均数都增大。当e′=1时,振动频率和声子平均数取极小值。
Based on a coordinate transformation, the boundary potential of a quantum rods is changed from the ellipsoidal form into a spherical one. The properties of strong-coupling magnetopolaron in a quantum rods in a three-dimensional anisotropic harmonic potential are studied using the linear combination operator and the unitary transformation methods. The relations of the vibrational frequency and mean number of phonons of strong-coupling magnetopolaron in a quantum rods with the cyclotron frequency of a magnetic field, electron-phonon coupling strength, aspect ratio of the ellipsoid and transverse and longitudinal effective confinement length are derived. Numerical calculation results show that the vibrational frequency and mean number of phonons increase with increasing of electron-phonon coupling strength and cyclotron frequency of a magnetic field and increase rapidly with decreasing transverse and the longitudinal effective confinement length. The vibrational frequency and mean number of phonons are increasing functions of the aspect ratio of the ellipsoid when e′〉 1, whereas they are decreasing functions of one when e′ 〈 1. When e′= 1, the vibrational frequency and mean number of phonons are the minimum values.
出处
《量子电子学报》
CAS
CSCD
北大核心
2010年第3期361-366,共6页
Chinese Journal of Quantum Electronics
基金
国家自然科学基金(10347004
10747002)
内蒙古自然科学基金(20080404MS0109)资助项目
关键词
光电子学
量子棒
线性组合算符
磁极化子
纵横比
optoelectronics
quantum rods
magnetopolaron
linear combination operator
aspect ratio
