The spin structure of quasi-two-dimensional biexcitons in quantum wells

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We explain the experimental observation of only zero-spin biexciton in GaAs 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 ±1 and two dark excitons with spins ±2. We suggest experiments that can detect the existence of the dark component of the biexciton wave function.

Original languageEnglish
Pages (from-to)728-734
Number of pages7
JournalEurophysics Letters
Issue number5
StatePublished - Sep 2002
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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