The polaron ground state in asymmetric double heterostructure (ADHS) is studied. Using
perturbation method, the binding energy and effective mass of a polaron are calculated and expressed as the
functions of the width of the center layer. In considering electron-phonon interactions, both the confined
longitudinal optical modes and the interface phonon modes are included. The results differ largely fromwhat
is in symmetric double heterostructure (DHS), for the contribution of the interface phonons is larger and
wider than in DHS, showing that the asymmetry in structure has a profound effect on the properties of
ADHS.