Eur. Phys. J. B 27, 577-582 (2002)
https://doi.org/10.1140/epjb/e2002-00192-y

Surface and interface optical phonon modes and electron-phonon interaction in a multi-shell spherical system

¹ Department of Physics, Guihuagang Campus, Guangzhou University, Guangzhou 510405, PR China
² Department of Physics, Beijing Normal University, Beijing 100875, PR China

Corresponding author: ^a zhangli-gz@263.net

Received: 16 October 2001
Revised: 23 January 2002
Published online: 25 June 2002

Abstract

Within the framework of the dielectric continuum model, interface optical(IO) and surface optical(SO) phonon modes and the Fröhlich electron-IO (SO) phonon interaction Hamiltonian in a multi-shell spherical system were derived and studied. Numerical calculation on CdS/HgS/H₂O and CdS/HgS/CdS/H₂O spherical systems have been performed. Results reveal that there are two IO modes and one SO mode for the CdS/HgS/H₂O system, one SO mode and four IO modes whose frequencies approach the IO phonon frequencies of the single CdS/HgS heterostructure with the increasing of the quantum number l for CdS/HgS/CdS/H₂O. It also showed that smaller l and SO phonon compared with IO phonon, have more significant contribution to the electron-IO (SO) phonon interaction.