Bose-Einstein Condensation in Semiconductors: The Key Role of Dark Excitons

Journal Article · Fri Oct 26 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.176403· OSTI ID:21024368

Combescot, Monique; Betbeder-Matibet, Odile ^[1]; Combescot, Roland ^[2]

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1. Institut des NanoSciences de Paris, Universite Pierre et Marie Curie, CNRS, Campus Boucicaut, 140 rue de Lourmel, 75015 Paris (France)
2. Laboratoire de Physique Statistique, Ecole Normale Superieure, 24 rue Lhomond, 75005 Paris (France)

Bose-Einstein condensation in semiconductors is controlled by the nonelementary-boson nature of excitons. Pauli exclusion between the fermionic components of composite excitons produces dramatic exchange couplings between bright and dark states. In microcavities, where bright excitons and photons form polaritons, they force the condensate to be linearly polarized, as observed. In bulk, they also force linear polarization, but of dark states, due to interband Coulomb scatterings. To evidence this dark condensate, indirect processes are thus needed.

• OSTI ID: 21024368
• Journal Information: Physical Review Letters, Vol. 99, Issue 17; Other Information: DOI: 10.1103/PhysRevLett.99.176403; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOSE-EINSTEIN CONDENSATION
COULOMB SCATTERING
EXCITONS
FERMIONS
PHOTONS
POLARIZATION
POLARONS
SEMICONDUCTOR MATERIALS