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  1. Home
  3. Spin-valley Rashba Monolayer Laser.
  1. Home
  3. Spin-valley Rashba Monolayer Laser.

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Spin-valley Rashba monolayer laser.

Kexiu Rong1, Xiaoyang Duan1, Bo Wang2

  • 1Atomic-Scale Photonics Laboratory, Russell Berrie Nanotechnology Institute, and Helen Diller Quantum Center, Technion - Israel Institute of Technology, Haifa, Israel.

Nature Materials
|July 6, 2023

View abstract on PubMed

Summary
This summary is machine-generated.

Researchers developed a novel spin-optical laser using a tungsten disulfide (WS₂) monolayer. This atomic-scale light source demonstrates robust spin polarization and coherence at room temperature, paving the way for advanced optical technologies.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Optoelectronics

Background:

  • Direct-bandgap transition metal dichalcogenide monolayers exhibit valley-contrasting optical selection rules, making them promising for spin-optical applications.
  • Atomic-scale light sources are crucial for next-generation optoelectronic devices.

Purpose of the Study:

  • To demonstrate a spin-optical monolayer laser utilizing a WS₂ monolayer integrated into a microcavity.
  • To investigate the generation and properties of photonic spin-valley resonances.

Main Methods:

  • Incorporation of a WS₂ monolayer into a heterostructure microcavity.
  • Generation of spin-valley modes via photonic Rashba-type spin splitting of a bound state in the continuum.
  • Utilizing inversion symmetry breaking to induce photonic spin-orbit interaction.

Main Results:

  • Demonstration of a functional spin-optical monolayer laser with intrinsic spin polarizations.
  • Observation of high spatial and temporal coherence in the laser output.
  • Achieved valley coherence in the WS₂ monolayer under arbitrary pump polarizations at room temperature.
  • Exhibited symmetry-enabled robustness features.

Conclusions:

  • The developed monolayer laser integrates electron and photon spins for coherent light generation.
  • Monolayer-integrated spin-valley microcavities offer new possibilities for classical and non-classical spin-optical light sources.
  • This work advances the development of atomic-scale, coherent spin-optical devices.