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Van der Waals heterostructure polaritons with moiré-induced nonlinearity.
Long Zhang1,2, Fengcheng Wu3, Shaocong Hou4
1Physics Department, University of Michigan, Ann Arbor, MI, USA.
Nature
|March 4, 2021
Summary
Researchers achieved strong coupling between light and matter using moiré lattice excitons in a microcavity. This new platform enables control over quantum emitters up to liquid nitrogen temperatures.
Area of Science:
- Quantum optics
- Condensed matter physics
- Materials science
Background:
- Controlling light-matter interactions in cavities is crucial for modern science.
- Moiré potentials in 2D heterostructures allow tunable electronic excitations.
- Previous studies showed excitons in moiré lattices but lacked cooperative effects and strong light interaction.
Purpose of the Study:
- To establish cooperative coupling between moiré-lattice excitons and microcavity photons.
- To create a versatile platform for controlling both matter and light.
- To investigate the quantum confined nature of moiré excitons and their nonlinear optical properties.
Main Methods:
- Integration of MoSe2-WS2 heterobilayers within a microcavity.
- Observation of cooperative coupling up to liquid nitrogen temperature.
- Analysis of moiré polariton density dependence to study nonlinear effects.
Main Results:
- Achieved cooperative coupling between moiré-excitons and cavity photons.
- Demonstrated control of matter-light interactions up to 100 Kelvin.
- Observed strong nonlinearity, including exciton blockade, suppressed energy shift, and suppressed dephasing.
Conclusions:
- The developed moiré polariton system integrates strong nonlinearity with microscopic tuning.
- This platform allows for the study of collective phenomena in tunable arrays of quantum emitters.
- The findings pave the way for new quantum technologies based on engineered light-matter interactions.
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