Spectral Road Map of Strain-Split Bulk GaAs Excitons: Evidence of Excitation-Induced Dephasing

ORAL

Abstract

Thin films of bulk GaAs studied with two-dimensional coherent spectroscopy reveal strain-split heavy- (HH) and light-hole (LH) excitons with quantum interference. Excitation overlapping the HH continuum show strong excitation-induced dephasing (EID) and emission at the HH exciton for collinear polarization. The results are consistent with excitations beyond the perturbative $\chi^{(3)}$ regime. Cross-linear polarization suppresses the HH emission and enhances the LH exciton as well as HH biexciton emission. Two-quantum spectra at low excitation concentrations are also consistent with HH and LH exciton interference and EID. Results are compared to four-wave mixing transients that require modelling for interpretation.

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Authors

  • Daniel Webber

    • Dalhousie University

  • Kimberley Hall

    • Dalhousie University

  • Brian Wilmer

    • West Virginia University

  • Alan Bristow

    • West Virginia University

  • Xinyu Liu

    • Department of Physics, University of Notre Dame
    • University of Notre Dame

  • Margaret Dobrowolska

    • Department of Physics, University of Notre Dame
    • University of Notre Dame

  • Jacek Furdyna

    • Department of Physics, University of Notre Dame
    • University of Notre Dame