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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
Summary
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.
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.
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