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Van der Waals Interactions01:24

Van der Waals Interactions

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Updated: Jan 24, 2026

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A Magnon-photon interface based on Van der Waals Magnetic semiconductor.

Qian Hu1,2, Yuqing Huang3,4, Jiangang Feng5,6

  • 1State Key Laboratory of Semiconductor Physics and Chip Technologies, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China.

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|January 22, 2026
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This summary is machine-generated.

Researchers developed a new magnetic metasurface using CrSBr to control light with electron spins. This breakthrough enables tunable hybrid magnon-exciton polaritons for advanced opto-spintronic and quantum devices.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Optics
  • Materials Science

Background:

  • Coherent control of light using electron spins is crucial for opto-spintronics, chiroptics, and quantum information.
  • Magnetic materials with coherent magnons offer potential for spin-photon interactions, but lack suitable photonic structures for strong light-matter coupling.

Purpose of the Study:

  • To create a novel magnon-photon interface for coherent control of light with electron spins.
  • To investigate the formation and properties of magnetic exciton polaritons in a CrSBr metasurface.
  • To explore the modulation of exciton polaritons by coherent magnons.

Main Methods:

  • Fabrication of a CrSBr metasurface.
  • Investigation of magnetic exciton polariton formation and tuning via external magnetic fields.
  • Analysis of exciton polariton modulation by coherent magnon excitation.

Main Results:

  • Demonstrated the formation of magnetic exciton polariton bound states in the continuum (BICs) in the CrSBr metasurface.
  • Showcased tunable energy and radiative properties of these polaritons with an external magnetic field.
  • Observed modulation of exciton polaritons by coherent magnons, indicating hybrid magnon-exciton polariton states.

Conclusions:

  • The CrSBr metasurface provides a viable magnon-photon interface with strong light-matter interaction.
  • The hybrid magnon-exciton polaritons exhibit tunable properties and magnon mode- and k-dependent behavior.
  • This work establishes a new platform for developing spin-functional photonic and quantum devices.