Observation of topological polaritons and photonic magic angles in twisted van der Waals bi-layers

Abstract

Twisted two-dimensional bi-layers offer exquisite control on the electronic bandstructure through the interlayer rotation and coupling, enabling magic-angle flat-band superconductivity and moiré excitons. Here, we demonstrate how analogous principles, combined with large anisotropy, enable extreme control and manipulation of the photonic dispersion of phonon polaritons (PhPs) in van der Waals (vdW) bi-layers. We experimentally observe tunable topological transitions from open (hyperbolic) to closed (elliptic) dispersion contours in twisted bi-layered α-MoO3 at photonic magic angles, induced by polariton hybridization and robustly controlled by a topological quantity. At these transitions the bilayer dispersion flattens, exhibiting low-loss tunable polariton canalization and diffractionless propagation with resolution below λ0/40. Our findings extend twistronics and moiré physics to nanophotonics and polaritonics, with great potential for nano-imaging, nanoscale light propagation, energy transfer and quantum applications.

arXiv commentNature, in press

References in corpus (18)

• Magic-angle graphene superlattices: a new platform for unconventional superconductivity
• Moiré Excitons in Van der Waals Heterostructures
• Polaritons in layered 2D materials
• Signatures of moiré-trapped valley excitons in MoSe${}_2$/WSe${}_2$ heterobilayers
• Observation of Moiré Excitons in WSe2/WS2 Heterostructure Superlattices
• Highly confined low-loss plasmons in graphene-boron nitride heterostructures
• Sub-diffractional, volume-confined polaritons in a natural hyperbolic material: hexagonal boron nitride
• Resonantly hybridised excitons in moiré superlattices in van der Waals heterostructures
• Topological Transitions in Metamaterials
• Moiré excitons: from programmable quantum emitter arrays to spin-orbit coupled artificial lattices
• Direct observation of van der Waals stacking dependent interlayer magnetism
• Twistronics: Manipulating the Electronic Properties of Two-dimensional Layered Structures through their Twist Angle
• Strange metal in magic-angle graphene with near Planckian dissipation
• Infrared hyperbolic metasurface based on nanostructured van der Waals materials
• Photonic crystals for nano-light in moiré graphene superlattices
• Topological Exciton Bands in Moiré Heterojunctions
• Moiré Hyperbolic Metasurfaces
• Guiding, focusing, and sensing on the sub-wavelength scale using metallic wire arrays

Cited by in corpus (94)

• Chiral Quasi-Bound States in the Continuum
• Configure polaritons in twisted $\alpha$-MoO3
• Ultrathin quantum light source enabled by a nonlinear van der Waals crystal with vanishing interlayer-electronic-coupling
• Twisted Nano-optics: Manipulating Light at the Nanoscale with Twisted Phonon Polaritonic Slabs
• Enhanced Light-Matter Interaction in Two-Dimensional Transition Metal Dichalcogenides
• The 2021 Quantum Materials Roadmap
• Gate-tunable negative refraction of mid-infrared polaritons
• Doping-driven topological polaritons in graphene/α-MoO3 heterostructures
• Atomic Bose-Einstein condensate in a twisted-bilayer optical lattice
• Hybridized hyperbolic surface phonon polaritons at α-MoO3 and polar dielectric interfaces
• Negative refraction in hyperbolic hetero-bicrystals
• Moire quasi-bound states in the continuum
• Nanoscale-confined Terahertz Polaritons in a van der Waals Crystal
• Multiple and spectrally robust photonic magic angles in reconfigurable α-MoO3 trilayers
• Enabling propagation of anisotropic polaritons along forbidden directions via a topological transition
• Magic configurations in Moiré Superlattice of Bilayer Photonic crystal: Almost-Perfect Flatbands and Unconventional Localization
• Tailoring topological transition of anisotropic polaritons by interface engineering in biaxial crystals
• Twist-induced control of near-field heat radiation between magnetic Weyl semimetals
• Roadmap for Photonics with 2D Materials
• Bilayer Photonic Graphene
• Active tuning of highly anisotropic phonon polaritons in van der Waals crystal slabs by gated graphene
• Ultralow thermal conductivity in two-dimensional MoO${}_3$
• A perspective of twisted photonic structures
• Perspective: Phonon polaritons for infrared optoelectronics
• Electrically tunable moiré magnetism in twisted double bilayers of chromium triiodide
• Layer engineered interlayer excitons
• Surface Dyakonov-Cherenkov Radiation
• On-chip Light Trapping in Bilayer Moiré Photonic Crystal Slabs
• Giant and tunable excitonic optical anisotropy in single-crystal CsPbX${}_3$ halide perovskites
• Negative reflection and negative refraction in biaxial van der Waals materials
• Twist-induced Near-field Thermal Switch Using Nonreciprocal Surface Magnon-Polaritons
• Polariton Topological Transition Effects on Radiative Heat Transfer
• Roadmap on Nonlocality in Photonic Materials and Metamaterials
• In-plane hyperbolic polariton tuners in terahertz and long-wave infrared regimes
• Dipolar localization of waves in twisted phononic crystal plates
• Topological Gaps by Twisting
• Intrinsic Superflat Bands in General Twisted Bilayer Systems
• Broad-Spectral-Range Sustainability and Controllable Excitation of Hyperbolic Phonon Polaritons in $\alpha$-MoO3
• Two-dimensional natural hyperbolic materials: From polaritons modulation to applications
• Direct programming of confined Surface Phonon Polariton Resonators using the plasmonic Phase-Change Material In${}_3$SbTe${}_2$
• Radiative heat transfer in low-symmetry Bravais crystal
• Oxygen Deficient α-MoO3 with Promoted Adsorption and State-Quenching of H2O for Gas Sensor: A DFT Study
• Twisted two-dimensional material stacks for polarization optics
• Germanium monosulfide as a natural platform for highly anisotropic THz polaritons
• Unidirectional Ray Polaritons in Twisted Asymmetric Stacks
• Inelastic thermoelectric transport and fluctuations in mesoscopic system
• Observation of flat-band localization and topological edge states induced by effective strong interactions in electrical circuit networks
• Tunable optical topological transitions of plasmon polaritons in WTe2 van der Waals films
• Optical and dielectric properties of MoO${}_3$ nanosheets for van der Waals heterostructures
• Surface-Wave Propagation on Non-Hermitian Metasurfaces with Extreme Anisotropy
• Imaging Anisotropic Waveguide Exciton Polaritons in Tin Sulfide
• Probing Hyperbolic and Surface Phonon-Polaritons in 2D materials using Raman Spectroscopy
• Fourier modal method for Moiré lattices
• Chiral photonic super-crystals based on helical van der Waals homostructures
• Polaritonic Quantum Matter
• Emerging chiral optics from chiral interfaces
• Twist-tunable moiré optical resonances
• Moiré circuits: engineering magic-angle behaviors
• Twisted polaritonic crystals in thin van der Waals slabs
• Layer-Resolved Resonance Intensity of Evanescent Polariton Modes in Anisotropic Multilayers
• Canalization acoustic phonon polaritons in metal-MoO3-metal sandwiched structures for nano-light guiding and manipulation
• Twist-angle and thickness-ratio tuning of plasmon polaritons in twisted bilayer van der Waals films
• Ideal type-II Weyl points in twisted one-dimensional dielectric photonic crystals
• Photon Tunneling Reconstitution in Black Phosphorus/hBN Heterostructure
• Growth and Properties of Dislocated Two-dimensional Layered Materials
• Magnetic and ferroelectric phase diagram of twisted CrI${}_3$ layers
• Fano resonance enabled infrared nano-imaging of local strain in bilayer graphene
• Optimization of highly circularly polarized thermal radiation in $\alpha$-MoO${}_3$/$\beta$-Ga${}_2$O${}_3$ twisted layers
• Optical Hall response of bilayer graphene: the manifestation of chiral hybridised states in broken mirror symmetry lattices
• Enhanced colloidal transport in twisted magnetic patterns
• Spintwistronics: Photonic bilayer topological lattices tuning extreme spin-orbit interactions
• Topological Degeneracy Induced by Twisting
• Spin-orbit interactions may relax the rigid conditions leading to flat bands
• Disorder scattering in classical flat channel transport of particles between twisted magnetic square patterns
• Misalignment between the Directions of Propagation and Decay of Nanoscale-confined Polaritons
• Bilayer twisting as a mean to isolate connected flat bands in a Kagome lattice through Wigner crystallization
• Retrieving optical parameters of emerging van der Waals flakes
• Anomalous Reflection From Hyperbolic Media
• Dielectric permittivity tensor dynamics of in-plane hyperbolic van der Waals MoOCl2 and emergent chiral photonic applications
• Spin and Valley Polarized Multiple Fermi Surfaces of α-RuCl${}_3$/Bilayer Graphene Heterostructure
• Observation of metallic electronic structure in a single-atomic-layer oxide
• Photonic and plasmonic transition radiation from graphene
• Two-dimensional moiré phonon polaritons
• Localized interfacial Phonon Modes at the Electronic Axion Domain Wall
• Manipulating Topological Polaritons in Optomechanical Ladders
• Hyperbolic Continuous Topological Transition in Real Space
• Long-range mid-infrared energy transfer mediated by hyperbolic phonon polaritons
• Designing a Transition Photonic Band with a Synthetic Moire Sphere
• Canalized hyperbolic magnetoexciton polaritons enabled by the Shubnikov-de Haas effect in van der Waals semiconductors
• Manipulate Quantum Emission by Interface States between Multi-component Moiré Lattice and Metasurface
• Magnetic colloidal single particles and dumbbells on a tilted washboard moire pattern in a precessing external field
• Engineering Canalized Near-Field Radiative Heat Transfer between Fixed Nanoparticles with Twisted $\alpha$-MoO${}_3$ Trilayers
• Local optical conductivity of strain solitons in bilayer graphene with arbitrary soliton angle
• Unraveling phase transformation with phononic hyperbolicity using off-resonant terahertz light