The study of granular crystals, which are nonlinear metamaterials that consist of closely
packed arrays of particles that interact elastically, is a vibrant area of research that combines …

Topological insulators are a new phase of matter, with the striking property that conduction
of electrons occurs only on their surfaces,,. In two dimensions, electrons on the surface of a …

In 1832 Hamilton predicted that a collimated light beam propagating through a biaxial crystal
parallel to one of its optical axes refracts as a slanted cone within the crystal and emerges as …

The field of nonlinear dispersive waves has developed enormously since the work of Stokes,
Boussinesq and Korteweg–de Vries (KdV) in the nineteenth century. In the 1960s …

Magnetic effects at optical frequencies are notoriously weak, so magneto-optical devices
must be large to create a sufficient effect. In graphene, it has been shown that …

Graphene, a two-dimensional honeycomb lattice of carbon atoms, has been attracting much
interest in recent years. Electrons therein behave as massless relativistic particles, giving …

We experimentally demonstrate a topological transition of classical light in “photonic
graphene”:<? format?> an array of waveguides arranged in the honeycomb geometry. As …

We apply gain and loss to honeycomb photonic lattices and show that the dispersion
relation is identical to tachyons—particles with imaginary mass that travel faster than the …

We investigate the fractional Schrödinger equation with a periodic‐symmetric potential. In
the inverse space, the problem transfers into a first‐order nonlocal frequency‐delay partial …

Pseudospin, an additional degree of freedom inherent in graphene, plays a key role in
understanding many fundamental phenomena such as the anomalous quantum Hall effect …