Polarons : recent developments
Faculty of Sciences. Physics
AIP conference proceedings / American Institute of Physics. - New York
, p. 47-64
University of Antwerp
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.