Polarons in a Wurtzite GaN/AlN Quantum Well

The interaction between an electron and confined-Longitudinal-Optical phonons in a wurtzite(zinc-blende) GaN/AlN quantum well is studied by using the Lee-Low-Pines(LLP) variational method.The ground-state energy,first excited-state energy and the transition energy of the free polaron in wurtzite material QW are calculated as a function of well width.The effect of anisotropy of the wurtzite materials has been considered in the calculation.The results show that the polaron energy decreases with increasing the well width and finally approaches to the bulk value of GaN.The contributions of the electron-phonon interaction to the energy of polaron in a wurtzite GaN/AlN quantum well are greater than that in a GaAs/AlAs quantum well.Therefore,the contribution of electron-phonon interaction should be considered for the discussion of the election states in wurtzite GaN/AlN quantum well.