Phonon structure in dispersion curves and density of states of massive Dirac Fermions

Abstract

Dirac fermions exist in many solid state systems including graphene, silicene and other two dimensional membranes such as are found in group VI dichalcogenides, as well as on the surface of some insulators where such states are protected by topology. Coupling of those fermions to phonons introduces new structures in their dispersion curves and, in the case of massive Dirac fermions, can shift and modify the gap. We show how these changes present in angular-resolved photoemission spectroscopy of the dressed charge carrier dispersion curves and scanning tunneling microscopy measurements of their density of states. In particular we focus on the region around the band gap. In this region the charge carrier spectral density no longer consists of a dominant quasiparticle peak and a smaller incoherent phonon related background. The quasiparticle picture has broken down and this leads to important modification in both dispersion curves and density of states.

12 pages, 6 figures, to appear in PRB

References in corpus (13)

• Electric Field Effect in Atomically Thin Carbon Films
• Two Dimensional Atomic Crystals
• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Valley polarization in MoS2 monolayers by optical pumping
• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• First direct observation of Spin-textures in Topological Insulators : Spin-resolved ARPES as a probe of topological quantum spin Hall effect and Berry's phase
• Unexpected mass acquisition of Dirac fermions at the quantum phase transition of a topological insulator
• Optical conductivity of bilayer graphene with and without an asymmetry gap
• Electron-phonon Coupling on the Surface of the Topological Insulator Bi2Se3: Determined from Surface Phonon Dispersion Measurements
• Spin-Valley Optical Selection Rule and Strong Circular Dichroism in Silicene
• Optical Signatures of the Tunable Band Gap and Valley-Spin Coupling in Silicene
• Dynamical conductivity of AA-stacked bilayer graphene
• Longitudinal and spin/valley Hall optical conductivity in single layer $Mo{S}_2$

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• Surface plasmon amplification by stimulated emission of radiation in hyperbolic metamaterials
• Unveiling quasiparticle dynamics of topological insulators through Bayesian modelling
• Electron-phonon correlations on spin texture of gapped helical Dirac Fermions
• Strain- and doping-tunable optical resonance in Kekulé-Y graphene