Topological photonics is an emerging field of research, which is inspired by the discovery of
topological insulators. The introduction of topology endows traditional photonic systems with …

Here, we show that space-time modulations provide an exciting route to realize complex
nonreciprocal couplings, and, in particular, the elusive axion response. We develop an …

In time-reversal invariant electronic systems the scattering matrix is antisymmetric. This
property enables a spin-Hall effect, designated here as “scattering anomaly”, such that the …

Here, we show that isorefractive spacetime crystals with a travelling-wave modulation may
mimic rigorously the response of moving material systems. Unlike generic spacetime …

Nonreciprocity is a highly desirable feature in photonic media since it allows for control over
the traveling electromagnetic waves, in a way that goes far beyond ordinary filtering. One of …

Tellegen medium has long been a topic of debate, with its existence being contested over
several decades. It was first proposed by Tellegen in 1948 and is characterized by a real …

The optical isolation functionality is of key importance in many photonic systems. However, a
robust optical isolation is rather challenging to obtain due to the weak nonreciprocal …

It has recently been highlighted that nonreciprocal surface waves can be stopped in suitably
designed waveguides, leading to the formation of hotspots wherein the electromagnetic …

Generalized duality transformations significantly modify the constitutive relations of
electromagnetic media, preserving principal electromagnetic properties. Here, we …

The condensed matter Haldane and Kane-Mele models revolutionized the understanding of
what is an “insulator,” as they unveiled novel classes of media that behave as metals near …