Excitonic transitions in Be-doped GaAs/AlAs multiple quantum well

doi:10.1088/1674-1056/25/4/047302

Abstract A series of GaAs/AlAs multiple-quantum wells doped with Be is grown by molecular beam epitaxy. The photoluminescence spectra are measured at 4, 20, 40, 80, 120, and 200 K, respectively. The recombination transition emission of heavy-hole and light-hole free excitons is clearly observed and the transition energies are measured with different quantum well widths. In addition, a theoretical model of excitonic states in the quantum wells is used, in which the symmetry of the component of the exciton wave function representing the relative motion is allowed to vary between the two-and three-dimensional limits. Then, within the effective mass and envelope function approximation, the recombination transition energies of the heavy-and light-hole excitons in GaAs/AlAs multiple-quantum wells are calculated each as a function of quantum well width by the shooting method and variational principle with two variational parameters. The results show that the excitons are neither 2D nor 3D like, but are in between in character and that the theoretical calculation is in good agreement with the experimental results.

Keywords: GaAs/GaAlAs mulitiple quantum wells heavy-and light-hole excitons photoluminescence spectra variational calculation

Received: 31 October 2015
Revised: 30 December 2015
Accepted manuscript online:

PACS:	73.21.Fg	(Quantum wells)
	71.35.-y	(Excitons and related phenomena)
	71.55.Eq	(III-V semiconductors)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61178039) and the Natural Science Foundation of Shandong Province, China (Grant No. ZR2012FM028).

Corresponding Authors: Wei-Min Zheng
E-mail: wmzheng@sdu.edu.cn

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Wei-Min Zheng(郑卫民), Su-Mei Li(李素梅), Wei-Yan Cong(丛伟艳), Ai-Fang Wang(王爱芳), Bin Li(李斌), Hai-Bei Huang(黄海北) Excitonic transitions in Be-doped GaAs/AlAs multiple quantum well 2016 Chin. Phys. B 25 047302

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