Emission from Mesoscopic-Size Islands Formed in a GaAs/AlAs Double Layer Structure

• Authors: A. Wysmołek , B. Chwalisz , M. Potemski , R. Stępniewski , A. Babiński , S. Raymond , V. Thierry-Mieg
• Languages of publication: EN

Abstracts

EN

The nature of sharp emission lines which are present in macro-luminescence experiments on a type-II GaAs/AlAs double quantum well structure is discussed. The experiments, which also include micro-lumines- cence measurements, allowed us to conclude that the sharp emission lines observed originate from lateral GaAlAs islands of a fewμm in diameter. They serve as efficient type-I recombination centers for indirect excitons and/or carriers which diffuse in the GaAs/AlAs QW structure and strongly affect the emission processes observed in macro-luminescence experiments. These traps can easily be filled with electron-hole pairs, giving rise to the formation of neutral excitons as well as more complex excitonic molecules. Magneto-luminescence spectra from single islands resemble those observed for natural quantum dots formed in narrow GaAs quantum wells.

Keywords

EN

78.67.De; 78.20.Ls; 71.35.Lk; 73.20.-r; 78.47.+p

Discipline

• 73.20.-r: Electron states at surfaces and interfaces
• 71.35.Lk: Collective effects (Bose effects, phase space filling, and excitonic phase transitions)
• 78.20.Ls: Magneto-optical effects(for magneto-optical devices, see 85.70.Sq)
• 78.67.De: Quantum wells

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 106
• Issue: 3
• Pages: 367-381

Dates

published

2004-09

received

2004-06-10

Contributors

author

A. Wysmołek

• Institute of Experimental Physics, Warsaw University, Hoża 69, Warsaw, Poland
• Grenoble High Magnetic Field Laboratory, MPI/FKF and CNRS, Grenoble, France

author

B. Chwalisz

• Institute of Experimental Physics, Warsaw University, Hoża 69, Warsaw, Poland
• Grenoble High Magnetic Field Laboratory, MPI/FKF and CNRS, Grenoble, France

author

M. Potemski

• Grenoble High Magnetic Field Laboratory, MPI/FKF and CNRS, Grenoble, France

author

R. Stępniewski

• Institute of Experimental Physics, Warsaw University, Hoża 69, Warsaw, Poland

author

A. Babiński

• Institute of Experimental Physics, Warsaw University, Hoża 69, Warsaw, Poland
• Grenoble High Magnetic Field Laboratory, MPI/FKF and CNRS, Grenoble, France

author

S. Raymond

• Institute for Microstructural Sciences, NRC, Ottawa, K1A 0R6, Canada

author

V. Thierry-Mieg

• Laboratoire de Photonique et de Nanostructures, CNRS, 91460 Marcoussis, France

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Identifiers

DOI

10.12693/APhysPolA.106.367