Power-dependent time-resolved photoluminescence spectroscopy of GaAs/AlGaAs asymmetric coupled and uncoupled double quantum wells

  • Deborah Anne Lumantas National Institute of Physics, University of the Philippines Diliman
  • Neil Irvin Cabello National Institute of Physics, University of the Philippines Diliman
  • John Daniel Vasquez National Institute of Physics, University of the Philippines Diliman
  • Elmer S Estacio National Institute of Physics, University of the Philippines Diliman
  • Arnel A Salvador National Institute of Physics, University of the Philippines Diliman
  • Armando S Somintac National Institute of Physics, University of the Philippines Diliman

Abstract

We report experimental evidence of non-resonant phonon-assisted tunneling at room temperature in GaAs/AlGaAs asymmetric coupled double quantum well (ACDQW) using power-dependent time-resolved photoluminescence (TRPL) spectroscopy. Molecular beam epitaxy was used to grow both ACDQW and the reference sample, an uncoupled quantum well. A biexponential decay of the TRPL spectra of the ACDQW sample was observed characterized by an initial fast decay followed by a slow decay. The initial fast decay was attributed to the tunneling of electrons from the narrow well to the wide well. This was further substantiated by an increase in the decay time of the TRPL spectra of the wide well of the ACDQW with increasing pump power.

Published
2017-06-07
How to Cite
[1]
D. A. Lumantas, N. I. Cabello, J. D. Vasquez, E. Estacio, A. Salvador, and A. Somintac. Power-dependent time-resolved photoluminescence spectroscopy of GaAs/AlGaAs asymmetric coupled and uncoupled double quantum wells, Proceedings of the Samahang Pisika ng Pilipinas 35, SPP-2017-1E-04 (2017). URL: https://paperview.spp-online.org/proceedings/article/view/239.
Section
Condensed Matter and Materials Science