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Localization-dependent photoluminescence spectrum of biexcitons in semiconductor quantum wires.

Authors
Type
Published Article
Journal
Physical review letters
Publication Date
Volume
95
Issue
17
Pages
177404–177404
Identifiers
PMID: 16383868
Source
Medline
License
Unknown

Abstract

We study exciton and biexciton spectra in disordered semiconductor quantum wires by means of nanophotoluminescence spectroscopy. We demonstrate a close link between the exciton localization length along the wire and the occurrence of a biexciton spectral line. The biexciton signature appears only if the corresponding exciton state extends over more than a few tens of nanometers. We also measure a nonmonotonous variation of the biexciton binding energy with decreasing exciton localization length. This behavior is quantitatively well reproduced by the solution of the single-band Schrödinger equation of the four-particle problem in a one-dimensional confining potential.

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