Kinky plasmons in double layers of borophene-borophene and borophene-graphene

Abstract

We investigate the collective plasmon modes in double layer of two dimensional materials where either one or both of the layers have tilted Dirac cone. Consistent with quite generic hydrodynamic treatment, similar to double layer graphene systems we find two branches of plasmons. The in-phase oscillations of the two layers disperses as $\sqrt{q}$, while the out-of-phase mode disperses as $q$. When even one of the layers hosts tilted Dirac cone spectrum, the plasmonic kink which is a salient feature of a monolayer of tilted Dirac cone is inherited by both of these branches. In double layers composed of graphene (nontilted) and borophene (tilted) where the two layers have two different Fermi velocities, the velocity scale of plasmonic modes is set by the greater of the two. The kink always takes place when each plasmon mode crosses an energy scale ${\omega }_{\mathrm{kink}}$. When the two layers have different chemical potentials, there will be two such scales, and each of in-phase and out-of-phase modes develop two kinks. Moreover we find that an additional linearly dispersing overdamped mode of monolayer tilted Dirac cone system survives in the double layer system.

References in corpus (13)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Graphene plasmonics
• Room-Temperature Quantum Hall Effect in Graphene
• Dirac fermions in borophene
• Tilted anisotropic Dirac cones in quinoid-type graphene and alpha-(BEDT-TTF)_2I_3
• Observation of an anisotropic Dirac cone reshaping and ferrimagnetic spin polarization in an organic conductor
• Charge response function and a novel plasmon mode in graphene
• Effect of electron-hole asymmetry on optical conductivity in 8-Pmmn borophene
• Plasmonic excitations in Coulomb coupled N-layer graphene structures
• Electron-electron interactions in decoupled graphene layers
• Longitudinal conductivity of massless fermions with tilted Dirac cone in magnetic field
• Magnetoplasmons of the tilted-anisotropic Dirac cone material $\alpha -$(BEDT-TTF)${}_2$I${}_3$

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• Electrodynamics of tilted Dirac/Weyl materials: A unique platform for unusual surface plasmon polaritons
• Synthetic non-Abelian gauge fields and gravitomagnetic effects in tilted Dirac cone systems
• Oblique and asymmetric Klein tunneling across smooth NP junctions or NPN junctions in 8-Pmmn borophene
• Sound of Fermi arcs
• Undamped transverse electric mode in undoped two-dimensional tilted Dirac cone materials
• Electronic properties of the Dirac and Weyl systems with first- and higher-order dispersion in non-Fermi-liquid picture
• Equations of macroscopic electrodynamics for two-dimensional crystals
• Dipolar optical plasmon in thin-film Weyl semimetals
• Synthetic plasmonic lattice formation through invariant frequency comb excitation in graphene structures
• Tunable plasmon modes and topological transitions in single- and bilayer semi-Dirac materials
• Collective light-matter interaction in plasmonic waveguide quantum electrodynamics