title: Are excitons really bosons?
abstract: Non-bosonic commutation relations of exciton operators discovered by Keldysh and Kozlov (1968 Zh. Eksp. Teor. Fiz. 54 978; 1968 Sov. Phys.-JETP 27 521 (Engl. Transl.)) led to a long-standing question about the possible difference between excitons and bosons in spite of the integer spin of excitons. In this paper the problem is analysed and it is shown that, in spite of the difference between separate excitons and bosons, the exciton gas is a Bose gas. Bosons comprising this gas are mixtures of separate excitons, and the non-bosonic nature of excitons leads only to a renormalization of the interaction between them. Features of the exciton luminescence coming from the interaction and non-bosonic nature of excitons are considered.
authors.affiliation: Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel.
authors.forename: B
authors.initials: B
authors.lastname: Laikhtman