Bosonic behavior of excitons and screening: a consistent calculation

Excitons have recently been shown to deviate from pure bosons at densities a hundred times smaller than the Mott density. The corresponding calculations relied on the unscreened excitonic ground state wavefunction. A consistent inclusion of screening, by use of the fundamental eigenfunction of the Hulthen potential, vindicates this approximation. (C) 2002 Elsevier Science B.V. All rights reserved.