Confined phonons in spherically capped quantum-dot/quantum well heterostructures

Full text: Conned optical phonons are studied in the case of a spherical Quantum-Dot/Quantum-Well (Q D/Q W) heterostructures in the framework of a phenomenological approach where the mechanical and the electrostatic matching boundary conditions are fulfilled at the Q D/Q W interfaces. The prototypical case used as example is a Q D/Q W formed by CdS/Hg S where the spherical shell of Hg S is sandwiched by an exterior spherical core of CdS. Over this structure we have used a host material considered as an infinite dielectric medium which will not participate of the polar optical vibrations. We are studying the normal modes for conned and for interface phonons, their frequencies dependence on the geometrical and on the material parameters. In this work, we are also showing the electron-phonon interaction Hamiltonian and discussing possible applications for this new capped Q D-Q W semiconductor heterostructure. (author)