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Cavity Floquet engineering.

Lingxiao Zhou1, Bin Liu2, Yuze Liu2

  • 1Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, MI, 48109-2122, USA.

Nature Communications
|September 5, 2024
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Summary
This summary is machine-generated.

Cavity engineering enhances Floquet engineering, enabling quantum manipulation at low light intensities. This breakthrough achieves significant spin and valley splitting in WSe2 excitons, paving the way for novel optical devices.

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Area of Science:

  • Quantum physics
  • Materials science
  • Optics

Background:

  • Floquet engineering manipulates quantum systems using light.
  • High intensities from ultrafast pulses limit current applications.
  • Optical Stark effect is a known example.

Purpose of the Study:

  • To overcome limitations of high field intensities in Floquet engineering.
  • To achieve Floquet effects at significantly lower light fluences.
  • To explore cavity-enhanced Floquet engineering for novel quantum applications.

Main Methods:

  • Cavity engineering of vacuum modes to enhance effective Floquet fields.
  • Utilizing low fluence light (450 photons/μm²) for Floquet effects.
  • Investigating spin and valley splitting in WSe2 excitons.

Main Results:

  • Orders-of-magnitude enhancement of the effective Floquet field.
  • Achieved 50 meV spin and valley splitting in WSe2 excitons.
  • Demonstrated an ultrafast, picojoule chirality XOR gate using optically controlled magnetic fields.

Conclusions:

  • Cavity-enhanced Floquet engineering enables low-fluence quantum manipulation.
  • Potential for creating steady-state Floquet bands and non-perturbative material modifications.
  • Opens applications for Floquet engineering across diverse materials and devices.