Comparison of the reflectivity spectra of GaAs-AlGaAs coupled and uncoupled asymmetric double quantum wells

Authors

Harold Co National Institute of Physics, University of the Philippines Diliman
Elizabeth Ann Prieto National Institute of Physics, University of the Philippines Diliman
Gerald Angelo Catindig National Institute of Physics, University of the Philippines Diliman
Karl Cedric Gonzales National Institute of Physics, University of the Philippines Diliman
John Daniel Vasquez National Institute of Physics, University of the Philippines Diliman
Arnel Salvador National Institute of Physics, University of the Philippines Diliman
Elmer S. Estacio National Institute of Physics, University of the Philippines Diliman
Armando S. Somintac National Institute of Physics, University of the Philippines Diliman

Abstract

Comparison between the low temperature reflectivity spectra of GaAs-Al_0.3Ga_0.7As coupled and uncoupled asymmetric double quantum wells with nominal well widths of 90Å and 51Å and nominal barrier widths of 25Å and 150Å is presented. For both the coupled and uncoupled quantum wells, higher order energy transitions were observed in the reflectivity spectra. Qualitative information on the carrier lifetime between wells was obtained based on the oscillator strength and relative broadening of the reflectivity features. Furthermore, possible occurrence of spatially indirect energy transitions due to wavefunction coupling between wells was observed associated with coupling effects both in the conduction and valence bands.

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Issue

2016: Proceedings of the 34th Samahang Pisika ng Pilipinas Physics Conference

Article ID

SPP-2016-PB-08

Section

Poster Session PB

Published

2016-08-18

How to Cite

[1]

H Co, EA Prieto, GA Catindig, KC Gonzales, JD Vasquez, A Salvador, ES Estacio, and AS Somintac, Comparison of the reflectivity spectra of GaAs-AlGaAs coupled and uncoupled asymmetric double quantum wells, Proceedings of the Samahang Pisika ng Pilipinas 34, SPP-2016-PB-08 (2016). URL: https://proceedings.spp-online.org/article/view/SPP-2016-PB-08.