Interlayer distance effects on absorption coefficient and refraction index change in p-type double-δ-doped GaAs quantum wells

doi:10.1088/1674-1056/ab5278

Abstract In the framework of the Thomas-Fermi (TF) approach, a model for the p-type double-δ-doped (DDD) system in GaAs is presented. This model, unlike other works in the literature, takes into account that the Poisson equation associated with the system is nonlinear. The electronic structure is calculated for heavy and light holes. The changes in the electronic structure result of the distance d between the doped layers are studied. In particular, the relative absorption coefficient as well as the relative refractive index change is calculated as a function of the incident photon energy for heavy holes. The effect of the interlayer distance exhibits, in the absorption coefficient, a red shift of the peak position and a decrease in amplitude when the distance increases. In addition, the relative refractive index change node has a red shift as well as the interlayer distance increases. The calculations show that the effect of the separation between layers has a greater influence on the linear terms. These results are very important for theoretical calculations and engineering of optical and electronic devices based in δ-doped GaAs.

Keywords: double delta-doping p-type GaAs layers electronic structure Thomas-Fermi approach nonlinear optical properties

Received: 25 September 2019
Revised: 26 October 2019
Accepted manuscript online:

PACS:	42.50.Gy	(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
	78.20.Ci	(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
	73.22.-f	(Electronic structure of nanoscale materials and related systems)
	73.21.Fg	(Quantum wells)

Fund: Project supported by PISA 2016-1 UJAT and PRODEP Folio UJAT-245 of México.

Corresponding Authors: L M Gaggero-Sager
E-mail: lgaggero@uaem.mx

Cite this article:

H Noverola-Gamas, L M Gaggero-Sager, O Oubram Interlayer distance effects on absorption coefficient and refraction index change in p-type double-δ-doped GaAs quantum wells 2019 Chin. Phys. B 28 124207

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Interlayer distance effects on absorption coefficient and refraction index change in p-type double-δ-doped GaAs quantum wells

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