非对称量子点中强耦合磁极化子的性质

采用线性组合算符和幺正变换方法研究了非对称量子点中强耦合磁极化子的性质。导出了非对称量子点中强耦合磁极化子的振动频率和基态结合能随量子点的横向和纵向有效受限长度、磁场的回旋频率和电子-声子耦合强度的变化关系。数值计算结果表明:非对称量子点中强耦合磁极化子的振动频率和基态结合能随量子点的横向和纵向有效受限长度的减小而迅速增大,表现出奇特的量子尺寸效应。振动频率和基态结合能随回旋频率的增加而增大,随电子-声子耦合强度的增加而增大。

Properties of Strong-coupling Magnetopolaron in an Asymmetry Quantum Dot

The properties of strong-coupling magnetopolaron in an asymmetric quantum dot are studied by using a linear combination operator and the unitary transformation method. The relation of the vibrational frequency and the ground state binding energy of strong-coupling magnetopolaron in an asymmetric quantum dot with the transverse and longitudinal effective confinement length of quantum dot,the cyclotron frequency of the magnetic field and the electron-phonon coupling strength are derived. Numerical calculations are performed and the results show that the vibrational frequency and ground state binding energy of strong-coupling magnetopolaron in an asymmetric quantum dot increase rapidly with decreasing the transverse and longitudinal effective confinement length of quantum dot. These can be attributed to the interesting quantum size effects. The vibrational frequency and ground state binding energy are an increasing function of the cyclotron frequency and the electron-phonon coupling strength.