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Topologically protected bound states in photonic parity-time-symmetric crystals.
TLDR
This work shows theoretically and experimentally the existence of states that are localized at the interface between two topologically distinct PT-symmetric photonic lattices, and finds analytical closed form solutions of topological PT-Symmetric interface states.
Topological funneling of light
TLDR
Using a time-dependent photonic lattice in which the topological properties can be controlled, Weidemann et al. show that such a structure can efficiently funnel light to the interface irrespective of the point of incidence on the lattice.
Switching Light at the Interface Between Anomalous Floquet Topological Insulators
We study interface states at the boundary between two Anomalous Floquet Photonic Topological Insulators and show how their interactions with an edge mode can be used to switch it via the topological
Nonlinearity-induced photonic topological insulator
TLDR
This work demonstrates a topological system, using a photonic platform, in which the existence of the topological phase is brought about by optical nonlinearity, providing a possible route for the development of compact devices that harness topological features in an on-demand fashion.
Efficient Light Funneling based on the non-Hermitian Skin Effect
In the last two decades, the ubiquitous effect of dissipation has proven to entail astonishing non-Hermitian features, rather than just being an inescapable nuisance. As an alternative route to
A square-root topological insulator with non-quantized indices realized with photonic Aharonov-Bohm cages
TLDR
This work studies a system where the spectral bands are associated with non-quantized indices, but nevertheless possess robust boundary states, and presents a theoretical analysis, where it is shown that the square of the Hamiltonian exhibits quantized indices.
Demonstration of a two-dimensional $${\cal P}{\cal T}$$PT-symmetric crystal
TLDR
The authors experimentally realize and characterize a two-dimensional PT-symmetric system using photonic lattice waveguides with judiciously designed refractive index landscape and an alternating loss distribution.
Topological Defect Engineering and PT Symmetry in Non-Hermitian Electrical Circuits.
TLDR
The findings unveil a future route for topological defect engineering and tuning in non-Hermitian systems of arbitrary dimension and resolve not only topological edge states, but also a novel PT-symmetric Z_{2} invariant of the bulk.
Fermionic time-reversal symmetry in a photonic topological insulator
TLDR
Counter-propagating chiral edge states are demonstrated in a photonic structure able to effectively incorporate fermionic time-reversal symmetry, thus providing the photonic implementation of an electronic topological insulator.
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