Hyperbolic plasmons in massive tilted 2D Dirac materials

Abstract

We explore topological transitions in the type of propagation of surface electromagnetic modes in massive anisotropic tilted Dirac systems. The presence of tilting and mass gives rise to an indirect band gap that strongly modifies the joint density of states compared to the gapless system. New van Hove singularities appear, and the interplay between intra and interband transitions leads to an anisotropic optical conductivity with imaginary parts acquiring opposite signs in orthogonal directions, opening the possibility of having hyperbolic propagation of plasmons. Isofrequency contours and low plasmon losses, as obtained from the dispersion relation, show that transitions between purely anisotropic quasi-elliptical and well-defined, highly directional, hyperbolic modes are attainable only when tilt and mass coexist. Fine-tuning in the THz regime suggests that this might be useful as a dynamical probe of concurring tilt and mass in Dirac materials.

6 pages, 5 figures

References in corpus (23)

• Tilted anisotropic Dirac cones in quinoid-type graphene and alpha-(BEDT-TTF)_2I_3
• Strain-induced pseudomagnetic field in Dirac semimetal borophene
• Van der Waals thin films of WTe2 for natural hyperbolic plasmonic surfaces
• Observation of an anisotropic Dirac cone reshaping and ferrimagnetic spin polarization in an organic conductor
• Black Phosphorus Plasmonics: Anisotropic Elliptical Propagation and Nonlocality-Induced Canalization
• Effect of electron-hole asymmetry on optical conductivity in 8-Pmmn borophene
• Flat optical conductivity in ZrSiS due to two-dimensional Dirac bands
• Optical properties of massive anisotropic tilted Dirac systems
• Probing quantum criticality using nonlinear Hall effect in a metallic Dirac system
• Highly anisotropic two-dimensional metal in monolayer MoOCl${}_2$
• Magnetoplasmons of the tilted-anisotropic Dirac cone material $\alpha -$(BEDT-TTF)${}_2$I${}_3$
• Tunable Low-Loss Hyperbolic Plasmon Polaritons in a T${}_d$-WTe${}_2$ Single Layer
• Valley symmetry breaking and gap tuning in graphene by spin doping
• Theroy of anisotropic plasmons
• Valley-dependent time evolution of coherent electron states in tilted anisotropic Dirac materials
• Hyperbolic plasmon modes in tilted Dirac cone phases of borophene
• Valley caloritronics in a photodriven hetero-junction of Dirac materials
• MoTe2 as a natural hyperbolic material across the visible and the ultraviolet region
• Hyperbolicity in 2D transition metal ditellurides induced by electronic bands nesting
• Possible Current-Induced Phenomena and Domain Control in an Organic Dirac Fermion System with Weak Charge Ordering
• Experimental Confirmation of Massive Dirac Fermions in Weak Charge-Ordering State in α-(BEDT-TTF)_2I_3
• Low-energy effective theory and anomalous Hall effect in monolayer ${\mathrm{WTe}}_2$
• Natural hyperbolicity in the layered hexagonal crystal structure

Cited by in corpus (9)

• Anisotropic effects in two-dimensional materials
• Two-dimensional natural hyperbolic materials: From polaritons modulation to applications
• Quantum kinetic theory of nonlinear thermal current
• Signatures of Lifshitz transition in the optical conductivity of two-dimensional tilted Dirac materials
• Highly anisotropic optical conductivities in two-dimensional tilted semi-Dirac bands
• Effects of spatial dimensionality and band tilting on the longitudinal optical conductivities in Dirac bands
• Transverse Josephson diode effect in tilted Dirac systems
• Thermal difference reflectivity of tilted 2D Dirac materials
• Designer gapped and tilted Dirac cones in lateral graphene superlattices