Linear polarization of photoluminescence in quantum wires

W. H. Zheng, Jian Bai Xia, Kok Wai CHEAH*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

17 Citations (Scopus)

Abstract

The linear character of the polarization of the luminescence in porous Si is studied experimentally, and the corresponding luminescence characteristics in quantum wires are studied theoretically using a quantum cylindrical model in the framework of the effective-mass theory. From the experimental and theoretical results it is concluded that there is a stronger linear polarization parallel to the wire direction than there is perpendicular to the wire, and that it is connected with the valence band structure in quantum confinement in two directions. The theoretical photoluminescence spectra of the parallel and perpendicular polarization directions, and the degree of polarization as functions of the radius of the wire and the temperature are obtained for In0.53Ga0.47 As quantum wires and porous silicon. From the theory, we demonstrated that the degree of polarization decreases with increasing temperature and radius, and that this effect is more apparent for porous Si. The theoretical results are in good agreement with the experimental results for the InGaAs quantum wires, and in qualitative agreement with those for the porous silicon.

Original languageEnglish
Pages (from-to)5105-5116
Number of pages12
JournalJournal of Physics Condensed Matter
Volume9
Issue number24
DOIs
Publication statusPublished - 16 Jun 1997

Scopus Subject Areas

  • Materials Science(all)
  • Condensed Matter Physics

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