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Electrically tunable layer-hybridized trions in doped WSe2 bilayers.

Raul Perea-Causin1,2, Samuel Brem3, Fabian Buchner4

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We demonstrate electrical control over layer-hybridized trions in WSe2 bilayers. An electric field tunes trion states, enabling new possibilities for optoelectronics using atomically-thin semiconductors.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Doped van der Waals heterostructures exhibit layer-hybridized trions, which are charged excitons with delocalized constituents.
  • These trions offer potential for advanced optoelectronic devices due to their controllability.

Purpose of the Study:

  • To investigate the electrical tunability of trion energy landscapes in WSe2 bilayers.
  • To understand the impact of electric fields on the properties and behavior of layer-hybridized trions.

Main Methods:

  • Combined a microscopic theory with photoluminescence (PL) experiments.
  • Utilized naturally stacked WSe2 bilayers and applied out-of-plane electric fields.
  • Analyzed the energetic ordering and PL signatures of trion states under varying electric fields and doping.

Main Results:

  • An out-of-plane electric field modifies the energetic ordering of lowest-lying trion states (layer-hybridized electrons, layer-localized holes).
  • At low fields, intralayer-like trions show distinct PL signatures with weak Stark shifts.
  • Above a critical field, interlayer-like trions become dominant, exhibiting a pronounced Stark red-shift and enhanced intensity due to phonon-assisted recombination.

Conclusions:

  • The study provides a deeper microscopic understanding of layer-hybridized trions in van der Waals heterostructures.
  • Demonstrates electrical control over trion states, paving the way for novel optoelectronic applications.
  • Highlights the potential of electrically tunable atomically-thin semiconductors for future devices.