Optical conductivity of bilayer dice lattices

Abstract

We calculate optical conductivity for bilayer dice lattices in commensurate vertically aligned stackings. The interband optical conductivity reveals a rich activation behavior unique for each of the four stackings. We found that the intermediate energy band, which corresponds to the flat band of a single-layer dice lattice, plays a different role for different stackings. The interband selection rules, which are crucial for the single-layer lattice, may become lifted in bilayer lattices. The results for effective and tight-binding models are found to be in qualitative agreement for some of the stackings and the reasons for the discrepancies for others are identified. Our findings propose optical conductivity as an effective tool to distinguish between different stackings in bilayer dice lattices.

22 pages, 14 multi-panel figures

References in corpus (25)

• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• Flat Bands in Slightly Twisted Bilayer Graphene
• Unusual Microwave Response of Dirac Quasiparticles in Graphene
• Discovery of topological chiral crystals with helicoid arc states
• New classes of chiral topological nodes with non-contractible surface Fermi arcs in CoSi
• Optical and magneto-optical far-infrared properties of bilayer graphene
• Zero modes of tight binding electrons on the honeycomb lattice
• Chiral anomaly and optical absorption in Weyl semimetals
• Electron states for gapped pseudospin-1 fermions in the field of charged impurity
• Optical signatures of multifold fermions in the chiral topological semimetal CoSi
• Optical properties of a semi-Dirac material
• Linear optical conductivity of chiral multifold fermions
• Magneto-optics of general pseudospin-s two-dimensional Dirac-Weyl fermions
• Finite-temperature plasmons, damping and collective behavior for $\alpha -{\mathcal{T}}_3$ model
• Probing Topological signatures in an optically driven $\alpha$-$T_3$ Lattice
• Optical conductivity of semi-Dirac and pseudospin-1 models: Zitterbewegung approach
• Many-Body Effects and Optical Properties of Single- and Double Layer $\alpha$-${\mathcal{T}}_3$ Lattices
• Optical response of two-dimensional Dirac materials with a flat band
• Nodal Semimetals: A Survey on Optical Conductivity
• Dynamical optical conductivity for gapped $\alpha -{\mathcal{T}}_3$ materials with a curved "flat" band
• Skin effect as a probe of transport regimes in Weyl semimetals
• Quantum transport in flat bands and super-metallicity
• Stackings and effective models of bilayer dice lattices
• Anomalous Electromagnetic Field Penetration in a Weyl or Dirac Semimetal
• Coulomb impurity on a Dice lattice: atomic collapse and bound states

Cited by in corpus (6)

• Stackings and effective models of bilayer dice lattices
• Flat bands and magnetism in $\mathbf{F}{\mathbf{e}}_4\mathbf{GeT}{\mathbf{e}}_2$ and $\mathbf{F}{\mathbf{e}}_5\mathbf{GeT}{\mathbf{e}}_2$ due to bipartite crystal lattices
• Moiré semiconductors on twisted bilayer dice lattice
• Generation of isolated flat bands with tunable numbers through Moiré engineering
• Emergent topology of flat bands in a twisted bilayer $\alpha$-$T_3$ lattice
• Geometry-Driven Moiré Engineering in Twisted Bilayers of High-Pseudospin Fermions