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Charge polarization effects on the optical response of blue-emitting superlattices

[+] Author Affiliations
Pedro Pereyra

UAM-Azcapotzalco, Departamento de Ciencias Básicas, México D.F., Mexico

Fatna Assaoui

University Mohammed V, Department of Physics, Scientific Faculty, Av. Ibn Battouta, Rabat, Morocco

J. Nanophoton. 11(2), 020501 (May 12, 2017). doi:10.1117/1.JNP.11.020501
History: Received March 8, 2017; Accepted April 18, 2017
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Abstract.  In the recently published finite periodic approach to study the optical response of periodic structures, successfully applied to study the optical properties of blue-emitting InGaN/GaN superlattices, the spontaneous charge polarization was neglected. To search the effect of this quantum confined Stark phenomenon, we study here the optical response, assuming parabolic band edge modulations in the conduction and valence bands. We discuss the consequences on the eigenfunction symmetries and the ensuing optical transition selection rules. Using the finite periodic approach in the Wentzel-Kramers-Brillouin approximation, we determine the energy eigenvalues, their corresponding eigenfunctions, and the subband structures in the conduction and valence bands. We calculate the photoluminescence as a function of the charge localization strength and compare it with the experimental result. We show that, for subbands close to the barrier edge, the optical response and the surface states are sensitive to charge polarization strength.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Pedro Pereyra and Fatna Assaoui
"Charge polarization effects on the optical response of blue-emitting superlattices", J. Nanophoton. 11(2), 020501 (May 12, 2017). ; http://dx.doi.org/10.1117/1.JNP.11.020501


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