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Weyl Points
Weyl points are topological degeneracies in the band structure of periodic media that are robust against perturbations due to their integer topological charge. In article number 2100452, Christina Jörg and co‐workers experimentally demonstrate splitting of a quadratic Weyl point of charge‐2 into two linear Weyl points with charge‐1 in 3D micro‐printed photonic crystals and measure their...
Weyl points are point degeneracies that occur in momentum space of 3D periodic materials and are associated with a quantized topological charge. Here, the splitting of a quadratic (charge‐2) Weyl point into two linear (charge‐1) Weyl points in a 3D micro‐printed photonic crystal is observed experimentally via Fourier‐transform infrared spectroscopy. Using a theoretical analysis rooted in symmetry...
We present the experimental observation of type-II optical Weyl points and corresponding Fermi arcs in a three-dimensional photonic structure. We employ a system composed of an array of staggered helical waveguides fabricated using the direct laser writing technique. Weyl points are established by observing conical diffraction and Fermi arcs are demonstrated by showing surface confinement (and deconfinement)...
We present the experimental realization of valley Hall topological edge states in armchair and bearded edge domain walls of inversion symmetry broken honeycomb lattices.
We predict a topological phase transition for paraxial light propagating through an array of evanescently-coupled helical waveguides. As a result of the transition, we observe a topological edge mode reverse its transverse propagation direction.
We employ “photonic boron nitride” — a silicon photonic crystal slab composed of a honeycomb lattice of holes — to observe Dirac physics of guided optical modes. The lattice is composed of two component triangular lattices of different hole-size Δr, which breaks the Dirac cone and opens up an observable band gap.
We propose the realization of topological zero-modes in a two-dimensional quantum spin Hall-like photonic topological insulator structure. Unlike topological edge or surface modes, these zero-modes are point-like and thus have two fewer dimensions than their host lattice.
We propose that waveguide array-based photonic topological insulators can be used to protect the entanglement of quantum states in photonic quantum walks. The promise of the field of ‘topological photonics’ lines in the use of the physics of the quantum Hall effect and topological insulators, usually associated with electrons passing through solid-state materials, to provide robustness to complex...
We employ ‘photonic boron nitride’, a silicon photonic crystal slab composed of a honeycomb lattice of holes to observe Dirac physics of guided optical modes. The lattice is composed of two component triangular lattices of different hole-size Δr, which breaks the Dirac cone and opens up an observable band gap.
We show that entangled photons propagating along the edge of a photonic topological insulator preserve their entanglement despite edge defects of any kind. This represents a novel methodology for the transport of quantum information.
We demonstrate theoretically and experimentally topological interface states in a passive effective PT-symmetric dimerized waveguide array. The PT-symmetric system has unbroken PT symmetry: all eigenvalues in the spectrum are real, despite the system's non-Hermiticity.
We present the first PT-symmetric topological insulator system: topologically-protected transport of edge states in PT-symmetric photonic honeycomb lattices.
We present photonic topological modes without a topological edge: topologically protected states which reside at a non-topological interface in the bulk of a photonic topological insulator (a honeycomb lattice of helical waveguides).
We show that it is possible to have topological transport in photonic quasicrytals, and therefore this lattices have one-way extended edgestates that are topologically protected against backscattering as they pass through defects or around corners.
Topological insulators have been recently extended to photonics; however, the measurement of their topological invariant has been limited to probing edge states, an indirect measure. Here we optically measure a topological invariant using only bulk information.
We propose the photonic topological Anderson insulator (FTAI), the first realization of the FTAI phase in any physical context (including condensed matter and cold atoms). In this phase, disorder counterintuitively induces a topological transition that breaks Anderson localization and leads to robust transport.
We review the recent progress on the first experimental demonstration of photonic topological insulators, along with a variety of new ideas associated with it.
We show that a Lieb photonic lattice of helical waveguides (without any external field) has one-way edge states that are topologically protected against backscattering as they pass through defects or around corners.
We study, experimentally and theoretically, interactions between a soliton and a transient trapping potential. The soliton can be guided by such a potential, while its motion is arrested at the potential minimum by radiation dampening.
We experimentally and theoretically demonstrate a topological transition in photonic graphene. By applying a uniaxial strain, the system transforms from one that supports states localized on the edge to one that does not.
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