Nano-Imaging of Landau-Phonon Polaritons in Dirac Heterostructures
Abstract
Polaritons are light-matter quasiparticles that govern the optical response of quantum materials and enable their nanophotonic applications. We have studied a new type of polaritons arising in magnetized graphene encapsulated in hexagonal boron nitride (hBN). These polaritons stem from hybridization of Dirac magnetoexciton modes of graphene with waveguide phonon modes of hBN crystals. We refer to these quasiparticles as the Landau-phonon polaritons (LPPs). Using infrared magneto nanoscopy, we imaged LPPs and controlled their real-space propagation by varying the magnetic field. These LLPs have large in-plane momenta and are not bound by the conventional optical selection rules, granting us access to the "forbidden" inter-Landau level transitions (ILTs). We observed avoided crossings in the LPP dispersion - a hallmark of the strong coupling regime - occurring when the magnetoexciton and hBN phonon frequencies matched. Our LPP-based nanoscopy also enabled us to resolve two fundamental many-body effects: the graphene Fermi velocity renormalization and ILT-dependent magnetoexciton binding energies. These results indicate that magnetic-field-tuned Dirac heterostructures are promising platforms for precise nanoscale control and sensing of light-matter interaction.
Keywords
Cite
@article{arxiv.2312.14093,
title = {Nano-Imaging of Landau-Phonon Polaritons in Dirac Heterostructures},
author = {Lukas Wehmeier and Suheng Xu and Rafael A. Mayer and Brian Vermilyea and Makoto Tsuneto and Michael Dapolito and Rui Pu and Zengyi Du and Xinzhong Chen and Wenjun Zheng and Ran Jing and Zijian Zhou and Kenji Watanabe and Takashi Taniguchi and Adrian Gozar and Qiang Li and Alexey B. Kuzmenko and G. Lawrence Carr and Xu Du and Michael M. Fogler and D. N. Basov and Mengkun Liu},
journal= {arXiv preprint arXiv:2312.14093},
year = {2023}
}