Abstract
An expression is obtained for the oscillator strength of the main exciton
transition, computed using a variational procedure in the approximation of an infinitely
deep quantum well. It is shown that this quantity is a factor of
(a<sub>B</sub>/λ)<sup>2</sup> greater than the oscillator strength in the bulk case
(a<sub>B</sub> is the Bohr radius of the bulk exciton, and λ is the variational
parameter), and this increases the polariton gap. The modulation effect by a sound wave
of the reflectance of light at the longitudinal-exciton frequency in superlattices is
considered, along with the diffraction of light at the sound wave. It is shown that
these effects can be achieved in superlattices at temperatures one and a half times as
great as for bulk crystals and with weaker requirements on their frequency.
© 2013 Optical Society of America
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