Volume 48, Number 3, November I 1999
|Page(s)||299 - 305|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Superfluidity of indirect biexcitons in superlattices
Institute of Spectroscopy, Russian Academy of Sciences Troitsk, 142092, Moscow region, Russia
2 Goteborg University, Chalmers University of Technology S-41296, Goteborg, Sweden
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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