Condensed Matter Physics, 2007, vol. 10, No. 2(50), p. 219228, English
DOI:10.5488/CMP.10.2.219

Title: Polaron density of states of AlAs/GaAs/AlAs and PbS/PbTe/PbS type quantum well
Author(s):
  V.I.Boichuk (Department of Theoretical Physics, Ivan Franko, Drohobych State Pedagogical University, 24 Ivan Franko Str.,82100 Drohobych, Ukraine) ,
  V.A.Borusevych (Department of Theoretical Physics, Ivan Franko, Drohobych State Pedagogical University, 24 Ivan Franko Str.,82100 Drohobych, Ukraine) ,
  I.P.Kogoutiouk (Department of Physics, Minnesota State University, Mankato, MN 56001, USA)

Polaron energy spectrum of AlAs/GaAs/AlAs and PbS/PbTe/PbS quasi two-dimensional heterostructure as a function of the wave-vector is investigated based on the adiabatic approximation and the Ritz variational technique. The electron interaction with confined,interface and half-space phonons is taken into account. A comparative analysis of the polaron energy spectrum in heterostructures with a finite and infinite breakdown of energy bands at the interface is performed by means of the Li-Lou-Pines variational method. The polaron density of states dependence as a function of energies with the values less than phonon energies is studied. The contribution of each phonon branch to the density of states is determined. A comparative analysis is made for two AlAs/GaAs/AlAs and PbS/PbTe/PbS heterostructures.

Key words: polaron, heterostructure, quantum well, density of states
PACS: 63.20.Kr, 79.60.Jv


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