Zhao-Yang Dong

Coupling effect of magnetic polariton in perforated metal/dielectric layered metamaterials and its influence on negative refraction transmission

The optical propagation properties and magnetic polariton behaviors in perforated metal/dielectric layered structures are numerically investigated at near-IR region. A developed three-metal-layer (TML) structure is specially inspected as a simple case. Strong coupling effect of magnetic polariton is discovered in this system, which explains why TML structure reveals better negative-refraction property than the reported double-metal-layer (DML) structure. A clear LC-circuit model is presented to describe the physical mechanism of this coupling effect of magnetic polaritons. Detailed results show that the thickness of metal layer influences the transmission greatly and an optimum value is found.

Numerical simulations of negative-index refraction in wedge-shaped metamaterials.

A wedge-shaped structure made of split-ring resonators (SRR) and wires is numerically simulated to evaluate its refraction behavior. Four frequency bands, namely, the stop band, left-handed band, ultralow-index band, and positive-index band, are distinguished according to the refracted field distributions. Negative phase velocity inside the wedge is demonstrated in the left-handed band and the Snells Law is conformed in terms of its refraction behaviors in different frequency bands. Our results confirmed that negative index of refraction indeed exists in such a composite metamaterial and also provided a convincing support to the results of previous Snells Law experiments.

Theoretical investigation of magnetic dynamics in α−RuCl3

We study spin-wave excitations in

Projective symmetry group classification of

\ensuremath{\alpha}\ensuremath{-}{\mathrm{RuCl}}_{3}

Z_3

by the spin-wave theory. Starting from the five-orbital Hubbard model and the perturbation theory, we derive an effective isospin-

parafermion spin liquids on a honeycomb lattice

1/2

Discovery of coexisting Dirac and triply degenerate magnons in a three-dimensional antiferromagnet

model in the large Hubbard (

Numerical simulation of a new kind of metamaterial with negative refraction property

U

Coupling of electromagnetic waves and superlattice vibrations in a piezomagnetic superlattice : Creation of a polariton through the piezomagnetic effect

) limit. Based on the energy-band structure calculated from the first-principles method, we find that the effective model can be further reduced to the

Spin-Glass Ground State in a Triangular-Lattice Compound YbZnGaO_{4}.

K\ensuremath{-}\mathrm{\ensuremath{\Gamma}}