Magnetoexciton light absorption in inhomogeneous quasi-two-dimensional systems |
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Authors: | Yu E Lozovik A M Ruvinskii |
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Institution: | (1) Institute of Spectroscopy, Russian Academy of Sciences, 142092 Troitsk, Moscow Region, Russia;(2) Moscow State Institute of Steel and Alloys, 117936 Moscow, Russia |
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Abstract: | The problem of exciton light absorption in quasi-two-dimensional inhomogeneous systems in a strong transverse magnetic field
H is analyzed. We assume that a random Gaussian field (“white noise”) acting separately on an electron and a hole is due to
(1) fluctuations in the quantum well thickness or (2) fluctuations in the concentrations of the solid solution components.
The problem of a magnetoexciton in a random Gaussian white noise field has been reduced to the problem of the motion in an
H-dependent effective field of a single particle with the effective magnetic mass of the exciton, which is a function of the
magnetic field and parameters of the quantum wells, in a field characterized by “colored noise,” whose correlation function
is different from that of the white noise field. In this approximation, the problem of a magnetoexciton in isolated and coupled
quantum dots is considered. In the coherent-potential approximation, the exciton absorption in random fields of the first
and second type in single and coupled quantum wells has been calculated. The absorption decreases as H increases in the range of strong magnetic fields, which is in agreement with experimental data.
Zh. éksp. Teor. Fiz. 114, 1451–1465 (October 1998) |
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