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Landau-phonon polaritons in Dirac heterostructures
Lukas Wehmeier1,2, Suheng Xu3, Rafael A Mayer1
1Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794, USA.
We discovered Landau-phonon polaritons (LPPs) in magnetized graphene, which can be halted at specific magnetic fields. This breakthrough offers new possibilities for nanoscale control and sensing in quantum materials.
Area of Science:
- Condensed Matter Physics
- Nanophotonics
- Quantum Materials
Background:
- Polaritons are crucial light-matter quasiparticles governing nanoscale optical responses.
- Quantum materials offer unique platforms for advanced optical applications like on-chip communication and sensing.
Purpose of the Study:
- To report the discovery of Landau-phonon polaritons (LPPs) in a novel material system.
- To investigate the unique propagation properties and underlying physics of these LPPs.
Main Methods:
- Utilizing infrared magneto-nanoscopy.
- Investigating magnetized charge-neutral graphene encapsulated in hexagonal boron nitride (hBN).
Main Results:
- Observed LPPs arising from the interaction of Dirac magnetoexcitons and hyperbolic phonon polaritons.
- Demonstrated the ability to completely halt LPP propagation at quantized magnetic fields.
- Distinguished between Fermi velocity renormalization and field-dependent magnetoexciton binding energies using LPP nanoscopy.
Conclusions:
- Magnetically tuned Dirac heterostructures provide precise nanoscale control over light-matter interactions.
- The discovered LPPs present new opportunities for advanced nanoscale sensing applications.
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