Abstract
Multiexcitons confined in InGaAs/GaAs quantum dots (QDs) with a lateral size slightly exceeding the exciton Bohr radius are investigated by magnetophotoluminescence spectroscopy at 2 K. The Coulomb correlations in the two-exciton complex result in an additional confinement, which increases with decreasing dot size, while a magnetic field reduces this effect. A three-exciton complex is confined only by the geometric confinement potential of the QD. The exciton-exciton repulsion increases with decreasing dot size, while a magnetic field decreases the repulsion strongly when the magnetic length becomes smaller than the lateral size of the QD. A shell model for the QD multiexciton states is proposed.
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References
S. Schmitt-Rink, D. A. B. Miller, and D. S. Chemla, Phys. Rev. B 35, 8113 (1987).
G. W. Bryant, Phys. Rev. B 41, 1243 (1990).
Y. Z. Hu, S. W. Koch, M. Lindberg et al., Phys. Rev. Lett. 64, 1805 (1990).
K. Brunner, G. Abstreiter, G. Böhm et al., Phys. Rev. Lett. 73, 1138 (1994).
R. Steffen, A. Forchel, T. L. Reinecke et al., Phys. Rev. B 54, 1510 (1994).
T. Demel, D. Heitmann, P. Grambow, and K. Ploog, Phys. Rev. Lett. 64, 788 (1990).
P. A. Maksym and T. Chakraborty, Phys. Rev. Lett. 65, 108 (1990).
A. A. Andreev, Y. M. Blanter, and Yu. E. Lozovik, Int. J. Mod. Phys. B 9, 1843 (1995).
V. Halonen, T. Chakraborty, and P. Pietilainen, Phys. Rev. B 45, 5980 (1992).
U. Bockelmann, Phys. Rev. B 50, 17271 (1994).
M. Bayer, A. Schmidt, A. Forchel et al., Phys. Rev. Lett. 74, 3439 (1995).
R. Rinaldi, P. V. Giugno, R. Cingolani et al., Phys. Rev. Lett. 77, 342 (1996).
A. Zrenner, L. V. Butov, M. Hagn et al., Phys. Rev. Lett. 72, 3382 (1994).
R. Steffen, T. Koch, J. Oshinowo, and A. Forchel, Appl. Phys. Lett. 68, 225 (1996).
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Pis’ma Zh. Éksp. Teor. Fiz. 66, No. 4, 263–268 (25 August 1997)
Published in English in the original Russian journal. Edited by Steve Torstveit.