Effect of a magnetic field on the excitonic luminescence line shape in a quantum well

I. Aksenov, J. Kusano, Y. Aoyagi, T. Sugano, T. Yasuda, and Y. Segawa
Phys. Rev. B 51, 4278 – Published 15 February 1995
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Abstract

The effect of magnetic field on the excitonic photoluminescence line shape has been studied in a high-quality single GaAs-AlxGa1xAs quantum well grown by the molecular-beam-epitaxy technique. An increase of magnetic field from 0 to 6 T has been found to result in (1) a decrease in the Lorentzian contribution Γ0 to the line shape from Γ0(0 T)=0.504±0.01 meV to Γ0(6 T)=0.336±0.01 meV due to the formation of a quasi-zero-dimensional density of states. This leads, in turn, to an increase in the exciton dephasing time due to the inhibition of the carrier relaxation, and (2) an increase in the Gaussian contribution from σ(0 T)=0.24 meV to σ(6 T)=0.39 meV, attributed to the shrinking of the exciton wave function in real space; the last effect causing the exciton to become more responsive to the statistical potential fluctuations at the quantum-well interfaces.

  • Received 21 July 1994

DOI:https://doi.org/10.1103/PhysRevB.51.4278

©1995 American Physical Society

Authors & Affiliations

I. Aksenov, J. Kusano, Y. Aoyagi, and T. Sugano

  • The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351, Japan

T. Yasuda and Y. Segawa

  • Photodynamics Research Center, RIKEN, Nagamachi, Aoba, Sendai 980, Japan

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Issue

Vol. 51, Iss. 7 — 15 February 1995

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