Phonon Sidebands in Monolayer Transition Metal Dichalcogenides

Dominik Christiansen, Malte Selig, Gunnar Berghäuser, Robert Schmidt, Iris Niehues, Robert Schneider, Ashish Arora, Steffen Michaelis de Vasconcellos, Rudolf Bratschitsch, Ermin Malic, and Andreas Knorr
Phys. Rev. Lett. 119, 187402 – Published 1 November 2017
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Abstract

Excitons dominate the optical properties of monolayer transition metal dichalcogenides (TMDs). Besides optically accessible bright exciton states, TMDs exhibit also a multitude of optically forbidden dark excitons. Here, we show that efficient exciton-phonon scattering couples bright and dark states and gives rise to an asymmetric excitonic line shape. The observed asymmetry can be traced back to phonon-induced sidebands that are accompanied by a polaron redshift. We present a joint theory-experiment study investigating the microscopic origin of these sidebands in different TMD materials taking into account intra- and intervalley scattering channels opened by optical and acoustic phonons. The gained insights contribute to a better understanding of the optical fingerprint of these technologically promising nanomaterials.

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  • Received 20 January 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.187402

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Dominik Christiansen1, Malte Selig1,*, Gunnar Berghäuser2, Robert Schmidt3, Iris Niehues3, Robert Schneider3, Ashish Arora3, Steffen Michaelis de Vasconcellos3, Rudolf Bratschitsch3, Ermin Malic2, and Andreas Knorr1

  • 1Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, 10623 Berlin, Germany
  • 2Chalmers University of Technology, Department of Physics, SE-412 96 Gothenburg, Sweden
  • 3Physikalisches Institut und Zentrum für Nanotechnologie, Universität Münster, 48149 Münster, Germany

  • *malte.selig@campus.tu-berlin.de

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Issue

Vol. 119, Iss. 18 — 3 November 2017

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