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Excitons and Cooper PairsTwo Composite Bosons in Many-Body Physics$
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Monique Combescot and Shiue-Yuan Shiau

Print publication date: 2015

Print ISBN-13: 9780198753735

Published to Oxford Scholarship Online: March 2016

DOI: 10.1093/acprof:oso/9780198753735.001.0001

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(p.340) 14 Biexcitons
Excitons and Cooper Pairs

Monique Combescot

Shiue-Yuan Shiau

Oxford University Press

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.

Keywords:   biexciton, relevant biexciton coordinate, molecular biexciton, exciton oscillator strength, photon absorption, biexciton line, oscillator strength

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