| Issue |
Europhys. Lett.
Volume 59, Number 5, September 2002
|
|
|---|---|---|
| Page(s) | 728 - 734 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00186-5 | |
| Published online | 01 September 2002 | |
The spin structure of quasi–two-dimensional biexcitons in quantum wells
Racah Institute of Physics, The Hebrew University - Jerusalem 91904, Israel
Corresponding author: smadari@shum.huji.ac.il
Received:
21
May
2002
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
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