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VOLUME 66 (1997) | ISSUE 5 | PAGE 332
Superfluidity of indirect magnetoexcitons in coupled quantum wells
The temperature Tc of the Kosterlitz—Thouless transition to a superfluid state for a system of magnetoexcitons with spatially separated electrons e and holes h in coupled quantum wells is obtained as a function of magnetic field Η and interlayer separation D. It is found that Tc decreases as a function of if and D at fixed exciton density ncx as a result of an increase in the exciton magnetic mass. The highest Kosterlitz-Thouless transition temperature as a function of JT increases (at small D) on account of an increase in the maximum magnetoexciton density nex versus magnetic field, where nex is determined by a competition between the magnetoexciton energy and the sum of the activation energies of incompressible Laughlin fluids of electrons and holes. PACS: 64.70.ja, 71.27.+a, 71.35.-Hz, 71.45.lx,