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Phonon-assisted upconversion in twisted two-dimensional semiconductors.

Yuchen Dai1, Pengfei Qi1,2, Guangyi Tao1,3

  • 1School of Physics, State Key Laboratory for Mesoscopic Physics, Academy for Advanced Interdisciplinary Studies, Collaborative Innovation Center of Quantum Matter, Nano-optoelectronics Frontier Center of Ministry of Education, Peking University, 100871, Beijing, China.

Light, Science & Applications
|January 1, 2023
PubMed
Summary
This summary is machine-generated.

Phonon-assisted photon upconversion (UPC) in twisted 2D semiconductors shows a 4-fold enhancement at 5.5° twist, while photoluminescence weakens. This angle-dependent effect offers new insights into light-matter interactions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Optics

Background:

  • Phonon-assisted photon upconversion (UPC) is an anti-Stokes process where photons gain energy from phonons.
  • Twisted 2D semiconductors offer unique electronic and optical properties due to interlayer coupling.

Purpose of the Study:

  • To investigate the effect of twist angle on phonon-assisted UPC in WSe2 twisted bilayers.
  • To understand the emergent inverted contrast between UPC and conventional photoluminescence (PL).

Main Methods:

  • Fabrication and characterization of WSe2 twisted bilayers with varying twist angles.
  • Optical spectroscopy to measure UPC and PL efficiencies.

Main Results:

  • A 4-fold enhancement in UPC was observed at a 5.5° twist angle.
  • Conventional photoluminescence (PL) intensity decreased by half at the same twist angle.
  • UPC enhancement is angle-dependent, attributed to reduced interlayer exciton conversion and enhanced pump efficiency.

Conclusions:

  • The study reveals a novel angle-dependent phenomenon in twisted 2D semiconductors, impacting light-matter interactions.
  • This work provides a platform for enhancing UPC in van der Waals heterostructures, expanding their application potential.