Electronic band structure of a type-II 'W' quantum well calculated by an eight-band k·p model

doi:10.1088/1674-1056/20/3/030507

Abstract In this paper, we present an investigation of type-II 'W' quantum wells for the InAs/Ga_1-xIn_xSb/AlSb family, where 'W' denotes the conduction profile of the material. We focus our attention on using the eight-band k ·p model to calculate the band structures within the framework of finite element method. For the sake of clarity, the simulation in this paper is simplified and based on only one period–AlSb/InAs/Ga_1-xIn_xSb/InAs/AlSb. The obtained numerical results include the energy levels and wavefunctions of carriers. We discuss the variations of the electronic properties by changing several important parameters, such as the thickness of either InAs or Ga_1-xIn_xSb layer and the alloy composition in Ga_1-xIn_xSb separately. In the last part, in order to compare the eight-band k ·p model, we recalculate the conduction bands of the 'W' structure using the one-band k ·p model and then discuss the difference between the two results, showing that conduction bands are strongly coupled with valence bands in the narrow band gap structure. The in-plane energy dispersions, which illustrate the suppression of the Auger recombination process, are also obtained.

Keywords: type-II 'W' quantum well Burt-Foreman Hamiltonian finite element methods

Received: 31 August 2010
Revised: 04 October 2010
Accepted manuscript online:

PACS:	05.65.tb
	73.21.Fg	(Quantum wells)
	73.20.-r	(Electron states at surfaces and interfaces)
	73.65.Ey

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60636030).

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Yu Xiu(迂修), Gu Yong-Xian(谷永先), Wang Qing(王青), Wei Xin(韦欣), and Chen Liang-Hui(陈良惠) Electronic band structure of a type-II 'W' quantum well calculated by an eight-band k·p model 2011 Chin. Phys. B 20 030507

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Electronic band structure of a type-II 'W' quantum well calculated by an eight-band k·p model

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