articlePhysical Review LettersMar 4, 2015LVBRONZE OA

Giant Enhancement of the Optical Second-Harmonic Emission of WSe 2 Monolayers by Laser Excitation at Exciton Resonances

GWGang WangXMX. MarieICIann C. GerberTAT. AmandDLD. Lagarde

Laboratoire de Physique et Chimie des Nano-Objets · Université Toulouse III - Paul Sabatier · +2 more institutions

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Abstract

We show that the light-matter interaction in monolayer WSe_{2} is strongly enhanced when the incoming electromagnetic wave is in resonance with the energy of the exciton states of strongly Coulomb bound electron-hole pairs below the electronic band gap. We perform second harmonic generation (SHG) spectroscopy as a function of laser energy and polarization at T=4 K. At the exciton resonance energies we record an enhancement by up to 3 orders of magnitude of the SHG efficiency, due to the unusual combination of electric dipole and magnetic dipole transitions. The energy and parity of the exciton states showing the strong resonance effects are identified in 1- and 2-photon photoluminescence excitation…

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Topics & keywords

Topics
Keywords
  • Exciton
  • Physics
  • Dipole
  • Photoluminescence
  • Atomic physics
  • Excitation
  • Photon energy
  • Polarization (electrochemistry)
UN Sustainable Development Goals
  • Affordable and clean energy
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