The spin structure of quasi–two-dimensional biexcitons in quantum wells
Racah Institute of Physics, The Hebrew University - Jerusalem 91904, Israel
Corresponding author: email@example.com
Accepted: 12 June 2002
We explain the experimental observation of only zero-spin biexciton in quantum wells, contrary to different spin configurations known in bulk crystals. Making use of the exciton Hamiltonian that reduces the four-body biexciton problem to two-exciton problem, we show that the only possible bound state of two excitons is a linear combination of two bright excitons with spins and two dark excitons with spins . We suggest experiments that can detect the existence of the dark component of the biexciton wave function.
PACS: 71.35.Cc – Intrinsic properties of excitons; optical absorption spectra / 42.50.Md – Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency / 78.55.-m – Photoluminescence
© EDP Sciences, 2002