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Type: Artigo de periódico
Title: Circular polarization from a nonmagnetic p-i-n resonant tunneling diode
Author: de Carvalho, HB
Brasil, MJSP
Gobato, YG
Marques, GE
Galeti, HVA
Henini, M
Hill, G
Abstract: The authors investigate the circular polarization of the electro- and photoluminescence emissions from the quantum well and contact layers of a nonmagnetic GaAs-AlAs p-i-n resonant tunneling diode under an external magnetic field. The contact emission evidences the formation of a spin polarized two-dimensional electron gas at the n-accumulation layer. The quantum well electroluminescence presents a strong sigma(-) degree of polarization, even for null Zeeman splitting energies, and a slight bias dependence. The observed circular polarization is mainly attributed to the spin polarization of the electrons injected into the quantum well from the two-dimensional electron gas. (c) 2007 American Institute of Physics.
Country: EUA
Editor: Amer Inst Physics
Citation: Applied Physics Letters. Amer Inst Physics, v. 90, n. 6, 2007.
Rights: aberto
Identifier DOI: 10.1063/1.2472522
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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