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

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.