title: Direct measurement of exciton-exciton interaction energy.
abstract: We report a direct measurement of the spectral function (real and imaginary self-energy) of excitons with a repulsive interaction potential. These results allow a stringent test of many-body theories of the exciton-exciton interaction which is independent of the exciton density calibration.
authors: Department of Physics and Astronomy, University of Pittsburgh, 3941 O'Hara Street, Pittsburgh, Pennsylvania 15260, USA.
authors: Z
authors: Z
authors: Vörös
authors: D W
authors: DW
authors: Snoke
authors: L
authors: L
authors: Pfeiffer
authors: K
authors: K
authors: West