Münster 1997 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 40: Poster III
HL 40.8: Poster
Freitag, 21. März 1997, 11:00–14:00, Z
Double and Triple Magnetopolarons in Quantum Wells — •V. I. Belitsky1, I. G. Lang2, L. I. Korovin2, A. Cantarero3, S. T. Pavlov4, and M. Cardona1 — 1Max-Planck-Institut f"ur Festk"orperforschung, Heisenbergstr. 1, D-70569 Stuttgart — 2A. F. Ioffe Physical Technical Institute, 194021 St Petersburg, Russia — 3University of Valencia, 46100 Burjassot (Valencia), Spain — 4P. N. Lebedev Physical Institute, Moscow, Russia
The Johnson-Larsen effect [1] appears when the energy separation of a pair of Landau levels equals the energy of optical phonon. We derive the equations for eigenstates and eigenenergies of the double and triple magnetopolarons in quantum well structures where electronic and vibrational excitations are resonantly coupled. An iteration procedure for obtaining the wave function and energy, including the contributions of diagrams with crossing phonon lines, is given. The results are used to evaluate the efficiency of Raman scattering by two LO-phonons. A strong increase of the scattering intensity along with the splitting of Raman peaks is predicted in the magnetopolaron regime. We show that under conditions of exact resonance the middle energy branch of the triply split magnetopolaron state consists of only two out of three bare states. The experimental verification of this prediction via two-phonon Raman scattering is suggested.
[1] E. J. Johnson, D.M.Larsen, Phys. Rev. Letters 16, 655 (1966).