Chapter 14 deals with biexcitons. Being made of two electrons and two holes, these particles are composite bosons. In this chapter, the relevant biexciton coordinates are first established. The biexciton creation operator is then constructed, with the biexciton viewed as being two interacting excitons. The two electrons (and the two holes) can have the same or opposite spins. This chapter concentrates on the opposite-spin configuration, which possibly leads to the formation of a bound molecular biexciton. Like trions, biexcitons are very poorly coupled to photons. The vanishingly small ratio of the biexciton oscillator strength to the exciton oscillator strength reflects the fact that the formation of a molecular biexciton is associated with the two exciton centers of mass being localized close to each other. This chapter also discusses the biexciton line in the photon absorption spectrum, and the fundamental difference between the biexciton line and the trion line.
Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.
If you think you should have access to this title, please contact your librarian.