非对称量子点中杂质束缚极化子性质

Properties of Impurity Bound Magnetopolaron in an Asymmetric Quantum Dot

采用线性组合算符和幺正变换方法,研究磁场对非对称量子点中弱耦合杂质束缚极化子性质的影响。导出了非对称量子点中弱耦合杂质束缚磁极化子振动频率和基态结合能随量子点的横向和纵向受限强度、磁场的回旋共振频率、库仑束缚势和电子-声子耦合强度的变化关系。数值计算结果表明:非对称量子点中弱耦合杂质束缚磁极化子振动频率和基态结合能随量子点的横向和纵向受限强度的增大而迅速增大,表现出奇特的量子尺寸效应。

The influences of the magnetic field on the properties of weak-coupling impurity bound polaron 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 weak-coupling impurity bound magnetopolaron in an asymmetric quantum dot with the transverse and longitudinal confinement strength of quantum dot,the cyclotron resonance frequency of the magnetic field,the Coulomb bound potential and the electron-phonon coupling strength ware derived. Numerical calculations are performed and the results show that the vibrational frequency and ground state binding energy of weak-coupling impurity bound magnetopolaron in an asymmetric quantum dot will increase strongly with increasing the transverse and longitudinal confinement strength of quantum dot. Those attributed to interesting quantum size effects also appear.