Title
Polarons : recent developments Polarons : recent developments
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York ,
Subject
Physics
Source (journal)
AIP conference proceedings / American Institute of Physics. - New York
Volume/pages
695(2003) , p. 47-64
ISSN
0094-243X
ISI
000188768400006
Carrier
E
Target language
English (eng)
Affiliation
University of Antwerp
Abstract
In this presentation three recent contributions to the theory of continuum (or "Frohlich"-) polarons are discussed. (i) Using a generalization of the Jensen-Feynman variational principle within the path-integral formalism for identical particles, the ground-state energy of a confined N-polaron system is studied as a function of N and of the electron-phonon coupling strength. (ii) Cyclotron-resonance (CR) spectra of a gas of interacting polarons in a GaAs/AlAs quantum well are theoretically investigated taking into account the magnetoplasmon-phonon mixing and the band nonparabolicity. The calculated CR spectra are in a good agreement with experimental data. The theory explains that, for a high-density polaron gas, anticrossing of the CR spectra occurs near the GaAs TO-phonon frequency rather than near the GaAs LO-frequency. (iii) A theoretical investigation of the optical properties of stacked quantum dots is presented, which is based on the non-adiabatic approach.
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