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Article Dans Une Revue Journal de Physique Colloques Année : 1980

EXCITONS AS A NEW QUANTUM SYSTEM

A. Mysyrowicz

Résumé

In a first part, a brief review of some excitonic properties is presented, with the accent put on their relevance with respect to the possibility of Bose-Einstein condensation. In a second part, recent experimental evidence is described, which supports the idea that excitonic particles may form a highly quantum fluid. In Cu20, the analysis of the exciton decay spectrum shows a gradual evolution of the gas from a classical regime at low densities up to a strongly degenerate one at high densities, with a chemical potential µ ~ 0. In CuCl excitons are unstable against formation of molecules (biexcitons). It is possible to generate directly a high density gas of biexcitons with momentum K ~ 0 by giant two-photon absorption. At low excitation, the observed molecular emission is in agreement with Maxwell -Boltzmann statistics. At high densities, strong deviations occur. In particular, the appearance of a sharp emission line is attributed to the presence of a Bose-Einstein condensate of excitonic molecules.

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jpa-00220181 , version 1 (04-02-2008)

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A. Mysyrowicz. EXCITONS AS A NEW QUANTUM SYSTEM. Journal de Physique Colloques, 1980, 41 (C7), pp.C7-281-C7-294. ⟨10.1051/jphyscol:1980743⟩. ⟨jpa-00220181⟩

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