Superfluidity of indirect biexcitons in superlattices |
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Authors: | Yu E Lozovik O L Berman M Willander |
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Institution: | 1. Institute of Spectroscopy, Russian Academy of Sciences, 142092, Troitsk, Moscow Region, Russia 2. G?teborg University, Chalmers University of Technology, S-41296, G?teborg, Sweden
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Abstract: | Instability in a system of interacting quasi-two-dimensional excitons in a type II superlattice of a finite thickness due
to attraction between oppositely-directed excitonic dipoles in neighboring layers has been discovered. A stable system is
that of indirect quasi-two-dimensional biexcitons formed by indirect excitons with dipole moments oriented in opposite directions.
The radius and binding energy of indirect biexcitons has been calculated. A collective spectrum of a system of such biexcitons
with a weak quadrupole interaction between them has been studied. Feasibility of Bose condensation, the density n
s(T) of the superfluid component, and a phase transition to the superfliud state in a low-density system of indirect biexcitons
have been analyzed.
Zh. éksp. Teor. Fiz. 115, 1786–1798 (May 1999) |
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