Effects of fermion exchanges on the polarization of exciton condensates

Abstract

Exchange processes are responsible for the stability of elementary boson condensates with respect to their possible fragmentation. This remains true for composite bosons when single fermion exchanges are included but spin degrees of freedom are ignored. We here show that their inclusion can produce a "spin-fragmentation" of a condensate of dark excitons, i.e., an unpolarized condensate with equal amount of dark excitons with spins (+2) and (-2). Quite surprisingly, for spatially indirect excitons of semiconductor bilayers, we predict that the condensate polarization can switch from unpolarized to fully polarized, depending on the distance between the layers confining electrons and holes. Remarkably, the threshold distance associated to this switching lies in the regime where experiments are nowadays carried out.

5 pages, 1 figure

References in corpus (2)

• Stability of a Bose-Einstein condensate revisited for composite bosons
• Polariton-polariton scattering: exact results through a novel approach

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• Fragmented Cooper pair condensation in striped superconductors
• Dynamical exciton condensates in biased electron-hole bilayers
• Anisotropic superfluidity of two-dimensional excitons in a periodic potential
• Statistical signatures of states orthogonal to the Fock-state ladder of composite bosons
• Signature of electromagnetic quantum fluctuations in exciton physics
• Nonlocal bunching of composite bosons