电场对三角量子阱中强耦合磁极化子性质的影响

Influence of the Electric Field on the Properties of Strong-coupling Magnetopolaron in a Triangular Quantum Well

采用LLP变分法和幺正变换的方法，研究了电场对三角量子阱中强耦合磁极化子性质的影响。通过理论推导得到了极化子基态结合能的表达式，结果显示极化子基态结合能分别是电子一声子耦合强度、电子面密度、磁场回旋频率及电场强度的函数。在不同电场下，通过数值计算分别得到了极化子基态结合能与电子一声子耦合强度、磁场回旋频率及电子面密度之间的函数关系。数值计算结果表明：极化子的基态结合能是电子一声子耦合强度和电场强度的增函数，而且是电子面密度和磁场回旋频率的减函数。

By LLP variational method and unitary transformation method, we studied the influence of the electric field on the properties of the strong-couping magnetopolaron in a triangular quantum well. The expression of the polaron＇ s ground state binding energy was obtained through theoretical derivation. The results showed that the polaron＇ s ground state binding energy is a function of the electron-phonon coupling strength, the electron areal density, the magnetic field convolution frequency, and the electric field strength. At different electric field, we derived the relations between the strong-couping magnetopolaron ground state binding energy with the electron-phonon coupling strength, the cyclotron resonance frequency of magnetic field, and the electron areal density, respectively. Our numerical results show that the strong- couping magnetopolaron ground state binding energy is an increasing function of the electron-phonon coupling strength and the electric field, whereas it is a decreasing function of electron areal density and the cyclotron frequency of the magnetic field.