Excitonic enhancement of the Fermi-edge singularity in a dense two-dimensional electron gas

W. Chen, M. Fritze, W. Walecki, A. V. Nurmikko, D. Ackley, J. M. Hong, and L. L. Chang
Phys. Rev. B 45, 8464 – Published 15 April 1992
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Abstract

We have investigated the interband recombination of dense two-dimensional (2D) electron gases in one-sided modulation-doped InxGa1xAs and GaAs asymmetric single quantum wells, under a near-resonance condition between an exciton level from a higher electronic subband and the Fermi level. Under such conditions, the excitonic resonant enhancement of the Fermi-edge singularity is clearly identified in both systems. The optical oscillator strength of the electrons at the Fermi level recombining with photoholes is enhanced by over two orders of magnitude through the resonant coupling with the exciton state. The strength and character of the interaction of the exciton with the 2D electron gas (∼0.6 meV) is determined by photoluminescence spectroscopy, including its dependence on temperature and an in-plane magnetic field. In a perpendicular magnetic field, the periodic modulation in the formation of such coupled many-electron excitons leads to very large B1-periodic intensity oscillations in the photoluminescence.

  • Received 8 October 1991

DOI:https://doi.org/10.1103/PhysRevB.45.8464

©1992 American Physical Society

Authors & Affiliations

W. Chen, M. Fritze, W. Walecki, and A. V. Nurmikko

  • Division of Engineering, Brown University, Providence, Rhode Island 02912
  • Department of Physics, Brown University, Providence, Rhode Island 02912

D. Ackley

  • Motorola Corporate Research, Phoenix, Arizona 85008

J. M. Hong and L. L. Chang

  • IBM Thomas J. Watson Research Laboratory, Yorktown Heights, New York 10598

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Vol. 45, Iss. 15 — 15 April 1992

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