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Researchers dynamically controlled interlayer excitons and trions in transition metal dichalcogenide (TMD) heterobilayers using nanoscale opto-electro-mechanical methods. This enables new strategies for advanced ultrathin photonic devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Transition metal dichalcogenide (TMD) heterobilayers exhibit complex photo-induced excitonic processes, including exciton interactions and exciton-trion conversion.
  • Controlling these nanoscale interactions in heterogeneous TMDs is crucial for developing advanced photonic devices but remains challenging.

Purpose of the Study:

  • To demonstrate dynamic control over interlayer excitons and trions in a WSe2/Mo0.5W0.5Se2 heterobilayer.
  • To investigate the interplay of excitons and trions under external stimuli at the nanoscale.

Main Methods:

  • Utilized multifunctional tip-enhanced photoluminescence (TEPL) spectroscopy with <20 nm spatial resolution.
  • Employed tip-induced engineering of GPa-scale pressure and plasmonic hot electron injection.
  • Performed simultaneous spectroscopic TEPL measurements for real-time analysis.

Main Results:

  • Achieved bandgap tunable interlayer excitons.
  • Demonstrated dynamic interconversion between interlayer trions and excitons.
  • Successfully controlled excitonic processes via combined nano-opto-electro-mechanical stimuli.

Conclusions:

  • Presented a novel approach for all-round dynamic control of excitonic and trionic states in TMD heterobilayers.
  • Highlighted the potential of this method for developing versatile nano-excitonic/trionic devices.
  • Opened new avenues for manipulating light-matter interactions at the nanoscale using TMDs.