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Title: Low temperature magneto-photoluminescence of GaAsBi /GaAs quantum well heterostructures

Strong optical anisotropy is observed in the emission from a GaAs{sub 1−x}Bi{sub x} (x ∼ 0.04) quantum well grown by low temperature molecular beam epitaxy on (001) GaAs by means of low temperature magneto-photoluminescence (MPL) taken at 2 K in Faraday geometry for magnetic fields, B, up to 10 T. A significant diamagnetic shift (∼2.5 meV) develops for magnetic fields above ∼8 T, which is accompanied by a narrowing of the emission bandwidth and a substantial increase in the difference between the integrated intensities of the σ{sup +} and σ{sup −} polarizations in the MPL spectra. This, along with a peculiar spectral dependence of the polarization degree which evolves with increasing magnetic field, is interpreted in terms of bound and free magneto excitons in the system where Bi-related levels become hybridized to different extents with the valence and conduction bands of the GaAs host material.
Authors:
; ;  [1] ; ;  [2] ;  [1] ;  [3] ; ;  [4] ;  [5]
  1. Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, Arkansas 72701 (United States)
  2. Departamento de Física, Universidade Federal de São Carlos, 13.565-905,São Carlos, São Paulo (Brazil)
  3. (Brazil)
  4. Department of Electrical Engineering, University of Arkansas, Fayetteville, Arkansas 72701 (United States)
  5. Institute of Semiconductor Physics, National Academy of Sciences, Kiev-03028 (Ukraine)
Publication Date:
OSTI Identifier:
22271134
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ANISOTROPY; BISMUTH COMPOUNDS; DIAMAGNETISM; EMISSION SPECTRA; EXCITONS; GALLIUM ARSENIDES; HETEROJUNCTIONS; MAGNETIC FIELDS; MOLECULAR BEAM EPITAXY; PHOTOLUMINESCENCE; POLARIZATION; QUANTUM WELLS; TEMPERATURE RANGE 0065-0273 K; VALENCE