How composite bosons really interact

Details How composite bosons really interact How composite bosons really interact

2005-05-16

arxiv.org/abs/cond-mat/0505389v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

39 pages, 12 figures

Scientific paper

10.1140/epjb/e2006-00007-3

The aim of this paper is to clarify the conceptual difference which exists between the interactions of composite bosons and the interactions of elementary bosons. A special focus is made on the physical processes which are missed when composite bosons are replaced by elementary bosons. Although what is here said directly applies to excitons, it is also valid for bosons in other fields than semiconductor physics. We in particular explain how the two basic scatterings -- Coulomb and Pauli -- of our many-body theory for composite excitons can be extended to a pair of fermions which is not an Hamiltonian eigenstate -- as for example a pair of trapped electrons, of current interest in quantum information.

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