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Electron-phonon effects on Stark shifts of bound polarons in quantum dot quantum well nanostructures

Y.Wang, Y.Xing, Z.P.Wang

Electron–phonon effects on Stark shifts of bound polarons in quantum dot quantum well nanostructures are studied theoretically by using a variational approach. The binding energy of the hydrogenic impurity state is calculated by taking the interaction of an electron with both the longitudinal optical phonons and the surface optical phonons into account. The interaction between impurity and longitudinal optical phonons has also been considered to obtain the binding energy of bound polarons. The numerical results for a CdS/HgS quantum dot quantum well nanostructure show that the Stark shift obviously increases as the core radius increases with the outer radius of spherical shell fixed and the electron–phonon effects give significant corrections to the binding energy.