Confinement of electromagnetic fields at the subwavelength scale via metamaterial
paradigms is an established method to engineer light–matter interaction in most common …

Plasmons are quantized collective oscillations of electrons and have been observed in
metals and doped semiconductors. The plasmons of ordinary, massive electrons have been …

Terahertz (THz) photonics is a key-enabling technology for a wealth of urgently demanding
applications and societal challenges like ultrahigh speed communication systems, medical …

Electrons with a linear energy/momentum dispersion are called massless Dirac electrons
and represent the low-energy excitations in exotic materials such as graphene and …

Topological insulators are innovative materials with semiconducting bulk together with
surface states forming a Dirac cone, which ensure metallic conduction in the surface plane …

Topological insulators are a new class of quantum materials with metallic (edge) surface
states and insulating bulk states. They demonstrate a variety of novel electronic and optical …

We present a detailed theoretical study of the Drude weight and optical conductivity of 8-P
mmn borophene having tilted anisotropic Dirac cones. We provide exact analytical …

1 T′-Mo S 2 exhibits valley-spin-polarized tilted Dirac bands in the presence of external
vertical electric field and undergoes a topological phase transition between the topological …

We have investigated plasmonic excitations at the surface of Bi 2 Se 3 (0001) via high-
resolution electron energy loss spectroscopy. For low parallel momentum transfer q∥, the …

We report on the electrodynamics of MnBi2Te4 thin films, an intrinsic magnetic topological
material. We study its optical conductivity from terahertz (THz) to ultraviolet (UV) frequencies …