The ground-state lifetime of bound polaron in a parabolic quantum dot

Abstract

The ground-state energy of bound polaron was obtained with strong electron–LO–phonon coupling using a variational method of the Pekar type in a parabolic quantum dot (QD). Quantum transition occurred in the quantum system due to the electron–phonon interaction and the influence of temperature. That is the polaron transit from the ground state to the first-excited state after absorbing a LO-phonon and it changes the polaron lifetime. Numerical calculations are performed and the results illustrate the relations of the ground-state lifetime of the bound polaron on the ground-state energy of polaron, the electron–LO–phonon coupling strength, the confinement length of the quantum dot, the temperature and the Coulomb binding parameter.