Anisotropic homogeneous linewidth of the heavy-hole exciton in (110)-oriented GaAs quantum wells

Rohan Singh, Travis M. Autry, Gaël Nardin, Galan Moody, Hebin Li, Klaus Pierz, Mark Bieler, and Steven T. Cundiff
Phys. Rev. B 88, 045304 – Published 8 July 2013

Abstract

The homogeneous and inhomogeneous linewidths of the heavy-hole exciton resonance in a (110)-oriented GaAs multiple-quantum-well sample are measured using optical two-dimensional Fourier transform spectroscopy. By probing the optical nonlinear response for polarization along the in-plane crystal axes [11¯0] and [001], we measure different homogeneous linewidths for the two orthogonal directions. This difference is found to be due to anisotropic excitation-induced dephasing, caused by a crystal-axis-dependent absorption coefficient. The extrapolated zero-excitation density homogeneous linewidth exhibits an activation-like temperature dependence. We find that the homogeneous linewidth extrapolated to zero excitation density and temperature is 34 μeV, while the inhomogeneous linewidth is 1.9 meV for both polarizations.

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  • Received 28 January 2013

DOI:https://doi.org/10.1103/PhysRevB.88.045304

©2013 American Physical Society

Authors & Affiliations

Rohan Singh1,2, Travis M. Autry1,2, Gaël Nardin1, Galan Moody1,2, Hebin Li1, Klaus Pierz3, Mark Bieler3, and Steven T. Cundiff1,2,*

  • 1JILA, University of Colorado & National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA
  • 2Department of Physics, University of Colorado, Boulder, Colorado 80309-0390, USA
  • 3Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany

  • *cundiff@jila.colorado.edu

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Vol. 88, Iss. 4 — 15 July 2013

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