Temperature effect on the ground state energy and the longitudinal optical-phonon mean number of the impurity polaron in asymmetrical 2D RbCl semi-exponential quantum wells

摘要

The ground state energy (GSE) and the longitudinal optical phonons (LOPs) mean number of the hydrogen-like impurity polaron in an asymmetrical two-dimensional semi-exponential quantum well (SEQW) are examined theoretically. The temperature effects on the GSE and the LOPs mean number are first obtained by the quantum statistics theory (QST). Then the variations of the GSE and the LOPs mean number with the Coulombic impurity potential (CIP) are calculated by using Lee-Low-Pines unitary transformation (LLPUT) and linear combination operation (LCO) methods. Our results indicate that the temperature and the CIP have important influences on the GSE and the LOPs mean number. It shows that the GSE and the LOPs mean number will increase with increasing temperature. The LOPs mean number is an increasing function of the CIP strength, whereas the GSE is reducing one of it. In addition, it finds three ways of controlling the asymmetrical SEQW's GSE and the LOPs mean number via adjusting the temperature, the confinement strength and Coulomb potential.