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Fundamental difference between measured and calculated exciton-phonon coupling in nanostructures

Peng Han1,2 and Gabriel Bester2,3,*

  • 1Department of Physics, Beijing Key Lab for Metamaterials and Devices, Beijing Advanced Innovation Center for Imaging Theory and Technology, Capital Normal University, Beijing 100048, China
  • 2Institut für Physikalische Chemie, Universität Hamburg, Grindelallee 117, D-20146 Hamburg, Germany
  • 3The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, D-22761 Hamburg, Germany

  • *gabriel.bester@uni-hamburg.de
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Phys. Rev. B 99, 100302(R) – Published 13 March, 2019

DOI: https://doi.org/10.1103/PhysRevB.99.100302

Abstract

Using ab initio density functional theory applied to semiconductor nanoclusters, we show that optical experiments where absorption is involved probe vibrations that are not necessarily the ones with large exciton-phonon matrix elements. The vibrations involved in these experiments must satisfy more stringent symmetry constraints than given by the selection rules of the exciton-phonon matrix elements. This resolves a long-standing observed discrepancy, while offering a viable theoretical approach to properly account for the experimental situation.

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Outline

Information

Phys. Rev. B 99, 100302(R)– Published 13 March, 2019
  • Received 17 July 2018
  • Revised 5 February 2019
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