| Issue |
Europhys. Lett.
Volume 48, Number 3, November I 1999
|
|
|---|---|---|
| Page(s) | 299 - 305 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i1999-00481-1 | |
| Published online | 01 September 2002 | |
Superfluidity of indirect biexcitons in superlattices
1
Institute of Spectroscopy, Russian Academy of Sciences Troitsk, 142092, Moscow region, Russia
2
Goteborg University, Chalmers University of Technology S-41296, Goteborg, Sweden
Received:
6
April
1999
Accepted:
2
September
1999
The instability of the ground state of a system of
two-dimensional spatially indirect excitons interacting in a slab of superlattice
with alternating electron and hole layers is established. The stable
system of spatially indirect quasi–two-dimensional biexcitons,
consisting in spatially indirect excitons with opposite directed
dipole moments is considered. The radius and the binding energy of
spatially indirect biexciton are calculated. The collective spectrum of
a low-density system of two-dimensional spatially indirect biexcitons,
interacting as electrical quadrupoles, is studied. The density of
the superfluid component 
and the Kosterlitz-Thouless phase
transition to the superfluid state in this system are analyzed.
PACS: 68.65.+g – Low-dimensional structures (superlattices, quantum well structures, multilayers): structure and nonelectronic properties / 71.35.Lk – Collective effects (Bose effects, phase space filling, and excitonic phase transitions) / 73.20.Dx – Electron states in low-dimensional structures (superlattices, quantum well structures and multilayers)
© EDP Sciences, 1999
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