Coherent coupling between exciton resonances governed by the disorder potential

Yuri D. Glinka, Zheng Sun, Mikhail Erementchouk, Michael N. Leuenberger, Alan D. Bristow, Steven T. Cundiff, Allan S. Bracker, and Xiaoqin Li
Phys. Rev. B 88, 075316 – Published 27 August 2013
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Abstract

Monolayer fluctuations in the thickness of a semiconductor quantum well (QW) lead to the formation of spectrally resolved excitons located in the narrower, average, and thicker regions of the QW. Whether or not these excitons are coherently coupled via Coulomb interaction is a long-standing debate. We demonstrate that different types of disorder potential govern coherent coupling among excitons, and the coupling strength can be quantitatively measured using optical two-dimensional Fourier transform spectroscopy. Strong coherent coupling occurs between certain types of excitons but is missing between other types of excitons because the distinctive nature of excitons results in different spatial overlap. Our finding may be applicable to other disordered systems, such as photosynthesis and conjugated polymers, where exciton coupling plays a critical role in determining charge and energy transfer.

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  • Received 3 October 2012

DOI:https://doi.org/10.1103/PhysRevB.88.075316

©2013 American Physical Society

Authors & Affiliations

Yuri D. Glinka1,2, Zheng Sun1, Mikhail Erementchouk3, Michael N. Leuenberger3, Alan D. Bristow4,5, Steven T. Cundiff4, Allan S. Bracker6, and Xiaoqin Li1,*

  • 1Department of Physics, University of Texas, Austin, Texas 78712, USA
  • 2Institute of Physics, National Academy of Sciences of Ukraine, Kiev, 03028, Ukraine
  • 3NanoScience Technology Center and Department of Physics, University of Central Florida, Orlando, Florida 32826, USA
  • 4JILA, University of Colorado and National Institute of Standard and Technology, Boulder, Colorado 80309-0440, USA
  • 5Department of Physics and Astronomy, West Virginia University, Morgantown, West Virginia 26506-6315, USA
  • 6Naval Research Lab, Washington, DC 20375, USA

  • *Corresponding author: elaineli@physics.utexas.edu

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Issue

Vol. 88, Iss. 7 — 15 August 2013

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