Role of Coulomb interactions in dark-bright magnetoexciton mixing in strained quantum wells

Y. D. Jho, F. V. Kyrychenko, J. Kono, X. Wei, S. A. Crooker, G. D. Sanders, D. H. Reitze, C. J. Stanton, and G. S. Solomon
Phys. Rev. B 72, 045340 – Published 19 July 2005

Abstract

Coupled magnetoexciton states between allowed (“bright”) and forbidden (“dark”) transitions are found in absorption spectra of strained In0.2Ga0.8AsGaAs quantum wells with increasing magnetic field up to 30T. We find large (9meV) energy splittings in the mixed states. The observed anticrossing behavior is independent of polarization, and sensitive only to the parity of the quantum confined states. Detailed experimental and theoretical investigations indicate that valence band complexity does not play a role. We find that the excitonic Coulomb interaction is a necessary condition for the anticrossing to occur, while the magnitude of the energy splitting correlates with strain. In addition, we determine the spin composition of the mixed states.

    • Received 13 October 2004

    DOI:https://doi.org/10.1103/PhysRevB.72.045340

    ©2005 American Physical Society

    Authors & Affiliations

    Y. D. Jho1,3, F. V. Kyrychenko1, J. Kono2, X. Wei3, S. A. Crooker4, G. D. Sanders1, D. H. Reitze1, C. J. Stanton1, and G. S. Solomon5

    • 1Department of Physics, University of Florida, Gainesville, Florida 32611, USA
    • 2Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA
    • 3National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
    • 4National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
    • 5Solid-State Laboratories, Stanford University, Stanford, California 94305, USA

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    Issue

    Vol. 72, Iss. 4 — 15 July 2005

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