Tunable superluminal and subluminal reflected group delay in an air-Weyl semimetal film-Weyl semimetal substrate layered system

Abstract

In this work, we theoretically investigate the superluminal and subluminal reflected group delay from an air-Weyl semimetal film-Weyl semimetal substrate layered structure by using 4*4 magneto-optical matrix. We show a tunable transition between positive and negative group delays of reflection pulse in such a layered structure controlled by the properties of the Weyl Semimetal layer and reveal its mechanism to control the propagation properties of the light pulse reflected from such structure. It is demonstrated that the reflected group delays are tunable from positive to negative values and vice versa, which are adjusted by tuning the incident angle, thickness of Weyl semimetal film, tilt parameter, and Fermi energy. The control of the magnitude and the sign of the reflected group delay of light propagation represent a key point in slow and fast light technologies. Our results are helpful to control the pulse propagations and are useful for design of Weyl semimetal-based delay devices.

References in corpus (19)

• Topological Insulators
• Topological insulators and superconductors
• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
• Weyl Semimetal in a Topological Insulator Multilayer
• Dirac semimetal in three dimensions
• Experimental discovery of Weyl semimetal TaAs
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Strong nonlinear optical response of graphene flakes measured by four-wave mixing
• Quantum Hall effects in a Weyl Semi-Metal: possible application in pyrochlore Iridates
• Topological Node-Line Semimetal in Three Dimensional Graphene Networks
• Topological nodal line semimetals
• Experimental discovery of a topological Weyl semimetal state in TaP
• Generalized 4 $\times$ 4 Matrix Formalism for Light Propagation in Anisotropic Stratified Media: Study of Surface Phonon Polaritons in Polar Dielectric Heterostructures
• New fermions on the line in topological symmorphic metals
• Epsilon-Near-Zero Response and Tunable Perfect Absorption in Weyl Semimetals
• Ultrafast Photoinduced Band Splitting and Carrier Dynamics in Chiral Tellurium Nanosheets
• Superconductivity Induced by High Pressure in Weyl Semimetal TaP
• Superluminal pulse reflection from a weakly absorbing dielectric slab