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HL: Halbleiterphysik

HL 22: Poster II

HL 22.42: Poster

Dienstag, 18. März 1997, 15:30–18:30, Z

Multiphonon Photoluminescence in Spherical Quantum Dots — •V. M. Fomin^1,2, V. N. Gladilin¹, E. P. Pokatilov¹, J. T. Devreese², S. N. Balaban¹, and S. N. Klimin¹ — ¹Department of Theoretical Physics, State University of Moldova, Str. Mateevici 60, MD-2009 Kishinev, Republic of Moldova — ²Departement Natuurkunde, U.I.A., Universiteitsplein 1, B-2610 Antwerpen, Belgium

A theory of the multiphonon photoluminescence in spherical quantum dots with the zincblende structure [1] is generalized by taking into account the splitting of the exciton ground state due to the exchange interaction. The Jahn-Teller effect and the external non-adiabaticity lead to the multiphonon transition probabilities which substantially differ from those obtained within the Huang-Rhys theory. The form of the luminescence band occurs to be different as compared to Franck-Condon (Pekar) one. The calculated luminescence spectra in CdSe quantum dots are in a good agreement with the experimental data [2], as regards both relative intensities of the peaks and the dependence of the band form on the quantum dot radius as well as on the frequency of the exciting light. This work is supported by NFWO, WOG (Belgium).

[1] V. M. Fomin, E. P. Pokatilov, J. T. Devreese, S. N. Klimin, S. N. Balaban, V. N. Gladilin, in: Proc. of the 23-rd ICPS (Berlin, July 21—26, 1996), World Scientific, Singapore, 1996, pp. 1961—1964.

[2] M. Nirmal, C. B. Murray, D. J. Norris, M. G. Bawendi, Z. Phys. D 26, 361 (1993).