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HL: Halbleiterphysik

HL 22: Poster II

HL 22.43: Poster

Tuesday, March 18, 1997, 15:30–18:30, Z

Polaron and Bipolaron States and Absorption of Intensive Light in Quantum Dots — •V. M. Fomin^1,2, S. N. Balaban¹, E. P. Pokatilov¹, J. T. Devreese², S. N. Klimin¹, and V. N. Gladilin¹ — ¹Department of Theoretical Physics, State University of Moldova, Str. Mateevici 60, MD-2009 Kishinev, Republic of Moldova — ²Departement Natuurkunde, Universitaire Instelling Antwerpen, Universiteitsplein 1, B-2610 Antwerpen, Belgium

The analysis of the influence of the electron confinement on the polaron energy and on the bipolaron binding energy [1] is extended to the case of quantum dots. The confinement in a quantum dot is described by a parabolic spherically symmetric potential. The Feynman variational principle is used. It is shown that the bipolaron binding energy as a function of the quantum dot radius has a maximum at the radii values of the order of the polaron radius. The problem of the absorption of a strong electromagnetic radiation in a quantum dot is timely due to the use of glasses with quantum dots as light filters. The multiphoton absorption coefficient is calculated for the main electron scattering mechanisms: on impurities, deformational, optical polar etc. It is shown that the dominating scattering mechanism changes with varying the quantum dot radius. This work is supported by NFWO, WOG (Belgium).

[1] E. P. Pokatilov, V. M. Fomin, J. T. Devreese, S. N. Balaban, S. N. Klimin, L. C. Fai, Superlattices and Microstructures 20, No. 1 (1996).