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Neutral and charged dark excitons in monolayer WS2.

M Zinkiewicz1, A O Slobodeniuk2, T Kazimierczuk1

  • 1Institute of Experimental Physics, Faculty of Physics, University of Warsaw, ul. Pasteura 5, 02-093 Warsaw, Poland. malgorzata.zinkiewicz@fuw.edu.pl maciej.molas@fuw.edu.pl.

Nanoscale
|August 28, 2020
PubMed
Summary

This study reveals that dark trions dominate light emission in WS2 monolayers. These dark trions exhibit a significantly longer decay rate compared to bright excitons, offering new insights into 2D semiconductor properties.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Transition Metal Dichalcogenides (TMDs) like WS2 are crucial 2D materials with unique optoelectronic properties.
  • Understanding excitonic states, particularly dark states, is key to advancing TMD device applications.
  • Encapsulation in hexagonal boron nitride (hBN) enhances TMD properties by reducing defects and charge noise.

Purpose of the Study:

  • Investigate the properties of dark excitons and dark trions in WS2 monolayers.
  • Determine the influence of magnetic fields on these states.
  • Characterize the decay dynamics and interactions of dark excitons and trions.

Main Methods:

  • Low-temperature, polarization-resolved magneto-photoluminescence spectroscopy.
  • Experimental setup utilizing perpendicular and parallel magnetic field configurations.
  • Analysis of emission spectra to identify and differentiate excitonic species.

Main Results:

  • WS2 monolayer is confirmed as an n-type doped semiconductor.
  • Dark trions are found to dominate the emission spectrum.
  • Coulomb exchange interaction coupling dark and grey excitons identified via polarization, but not for dark trions.
  • Determined g-factor for dark trions to be approximately -8.6.
  • Measured decay rate for dark trions is ~0.5 ns, over 100 times longer than bright excitons.

Conclusions:

  • Dark trions are the primary emissive species in this WS2 system.
  • The long decay rate of dark trions suggests potential for applications in quantum information and low-loss devices.
  • Magnetic field studies provide crucial parameters like the g-factor for dark trions.