Photoluminescence study of shallow acceptors in GaAs-Ga1xAlxAs cylindrical quantum-well wires

A. Latgé, N. Porras-Montenegro, and Luiz E. Oliveira
Phys. Rev. B 45, 6742 – Published 15 March 1992
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Abstract

A systematic study of the theoretical acceptor-related photoluminescence spectra in a cylindrical GaAs-(Ga,Al)As quantum-well wire is performed. The acceptor states are described within a variational scheme in the effective-mass approximation. Photoluminescence spectra associated with acceptors are calculated for both homogeneous and on-center spike-doped distributions of acceptors in the quantum-well wire. Results are dependent on the temperature, on the choice of the quasi-Fermi-energy level of the conduction-subband electron gas, and on the distribution of acceptors in the wire. The photoluminescence spectra corresponding to the on-center spike-doped Gaussian distribution (width of the doping spike of the order of 50 Å) shows a peak for energies associated with on-center impurity states, as is expected, whereas for a homogeneous distribution of acceptors in the well we essentially found an edge in the spectra associated with transitions involving on-center acceptors and a peaked structure related to the onset of transitions from the conduction subband to on-edge acceptors. Although no experimental results for GaAs-(Ga,Al)As quantum-well wires are available, our results agree qualitatively with previous theoretical and experimental work on GaAs-(Ga,Al)As quantum-well heterostructures.

  • Received 10 April 1991

DOI:https://doi.org/10.1103/PhysRevB.45.6742

©1992 American Physical Society

Authors & Affiliations

A. Latgé

  • Instituto de Física, Universidade Federal Fluminense, 24020 Niterói, Rio de Janeiro, Brazil

N. Porras-Montenegro

  • Departamento de Física, Universidade del Valle, Apartado Aéreo 25360, Cali, Colombia

Luiz E. Oliveira

  • Instituto de Física ‘‘Gleb Wataghin,’’ Universidade Estadual de Campinas(enUnicamp, CP 6165, Campinas, São Paulo 13081, Brazil

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Vol. 45, Iss. 12 — 15 March 1992

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