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Tailoring MoS2 Exciton-Plasmon Interaction by Optical Spin-Orbit Coupling.

Ziwei Li1, Yu Li1, Tianyang Han1

  • 1School of Physics, State Key Lab for Mesoscopic Physics; Academy for Advanced Interdisciplinary Studies; Collaborative Innovation Center of Quantum Matter, Peking University , Beijing 100871, China.

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Summary

Researchers enhanced molybdenum disulfide (MoS2) light emission using plasmonic nanostructures and spin-orbit coupling. This technique actively controls MoS2 photoluminescence for nanoscale spin-dependent devices.

Keywords:
MoS2exciton−plasmon interactionphotoluminescencespin−orbit coupling

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Molybdenum disulfide (MoS2) monolayers are 2D materials with excellent optoelectronic properties.
  • Weak light-matter interaction in monolayer MoS2 limits its photoluminescence emission.
  • Atomic thickness of MoS2 presents challenges for light-matter interaction.

Purpose of the Study:

  • Investigate MoS2 exciton-plasmon interaction with light's spin-orbit coupling (SOC).
  • Develop methods to actively control MoS2 photoluminescence.
  • Explore applications in nanoscale spin-dependent light-emitting devices.

Main Methods:

  • Designed and fabricated plasmonic spiral rings with subwavelength dimensions on hybrid substrates.
  • Investigated MoS2 photoluminescence enhancement by manipulating incident optical spin states, laser powers, and nanospiral geometries.
  • Utilized spin-orbit coupling (SOC) effects, explained via geometric and dynamic phases and the Majorana sphere model.

Main Results:

  • Achieved active control over MoS2 photoluminescence enhancement through near-field interactions.
  • Demonstrated MoS2 photoluminescence modulation by altering incident optical spin states and nanostructure geometry.
  • Realized planar light-emitting devices with SOC effects, controlled by light polarization.

Conclusions:

  • MoS2 light-matter interaction can be actively manipulated using plasmonic nanostructures and SOC.
  • The developed approach enables control over MoS2 photoluminescence via spin states and nanogeometry.
  • Results pave the way for nanoscale spin-dependent light-emitting devices.