Nonlinear optical response of Type-II Weyl fermions in two dimensions

Abstract

We present a theoretical model to study the nonlinear optical response of materials with a low-energy spectrum characterised by strongly tilted, type-II, Weyl cones in two dimensions, which we call 2D Weyl materials. Our findings reveal that the tilted nature of the Weyl cones is responsible for the appearance of even harmonics in the nonlinear signal, as well as its strong polarisation dependence. We discuss how it is possible to control such nonlinear response and envision how 2D Weyl materials can be used to realise novel photonic devices for sensing applications.

References in corpus (25)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Two-Dimensional Gas of Massless Dirac Fermions in Graphene
• Topological Insulators
• Magic-angle graphene superlattices: a new platform for unconventional superconductivity
• Weyl and Dirac Semimetals in Three Dimensional Solids
• Topological Photonics
• Topological Photonics
• Type-II Weyl Semimetals
• Artificial gauge potentials for neutral atoms
• Dirac materials
• Topological Quantum Matter with Ultracold Gases in Optical Lattices
• Lorentz-violating type-II Dirac fermions in transition metal dichalcogenide PtTe${}_2$
• Experimental Realization of Type-II Dirac Fermions in PdTe${}_2$ Superconductor
• Third harmonic generation in graphene and few-layer graphite films
• Robust Type-II Weyl Semimetal Phase in Transition Metal Diphosphides XP${}_2$ (X = Mo, W)
• Two-dimensional Weyl Half Semimetal and Tunable Quantum Anomalous Hall Effect in Monolayer PtCl${}_3$
• Observation of an anisotropic Dirac cone reshaping and ferrimagnetic spin polarization in an organic conductor
• Spin-layer locking of interlayer excitons trapped in moiré potentials
• A road to reality with topological superconductors
• Coulomb blockade in an atomically thin quantum dot coupled to a tunable Fermi reservoir
• High-order nonlinear optical response of a twisted bilayer graphene
• Dynamic current-current susceptibility in 3D Dirac and Weyl semimetals
• Two-dimensional type-II Dirac fermions in a LaAlO3/LaNiO3/LaAlO3 quantum well
• The Nonlinear Optical Effects of Opening a Gap in Graphene

Cited by in corpus (3)

• Signatures of Lifshitz transition in the optical conductivity of two-dimensional tilted Dirac materials
• Superconducting phase transition in planar fermionic models with Dirac cone tilting
• 2D Weyl Materials in the Presence of Constant Magnetic Fields