Terahertz conductivity of twisted bilayer graphene

Abstract

Using terahertz time-domain spectroscopy, the real part of optical conductivity [${\sigma }_1(\omega )$] of twisted bilayer graphene was obtained at different temperatures (10 -- 300 K) in the frequency range 0.3 -- 3 THz. On top of a Drude-like response, we see a strong peak in ${\sigma }_1(\omega )$ at $\sim$2.7 THz. We analyze the overall Drude-like response using a disorder-dependent (unitary scattering) model, then attribute the peak at 2.7 THz to an enhanced density of states at that energy, that is caused by the presence of a van Hove singularity arising from a commensurate twisting of the two graphene layers.

arXiv comment4 figures, 5 pages

References in corpus (21)

• Quantifying defects in graphene via Raman spectroscopy at different excitation energies
• Landau level degeneracy and quantum Hall effect in a graphite bilayer
• Biased bilayer graphene: semiconductor with a gap tunable by electric field effect
• Gate-induced insulating state in bilayer graphene devices
• Graphene bilayer with a twist: electronic structure
• Raman scattering from high frequency phonons in supported n-graphene layer films
• Electronic Properties of Disordered Two-Dimensional Carbon
• Asymmetry gap in the electronic band structure of bilayer graphene
• Observation of Van Hove singularities in twisted graphene layers
• Universal dynamical conductance in graphite
• Epitaxial graphene
• Continuum Model of the Twisted Bilayer
• Raman spectroscopy study of rotated double-layer graphene: Misorientation-angle dependence of electronic structure
• Drude Conductivity of Dirac Fermions in Graphene
• Graphene Terahertz Plasmon Oscillators
• Electronic properties of bilayer and multilayer graphene
• Phonon renormalisation in doped bilayer graphene
• Doping dependence of the Raman peaks intensity of graphene near the Dirac point
• Theory of carrier transport in bilayer graphene
• Ultrafast carrier dynamics in pristine and FeCl3-intercalated bilayer graphene
• Tuning impurity states in bilayer graphene

Cited by in corpus (14)

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• Electronic properties of graphene-based bilayer systems
• Helical networks in twisted bilayer graphene under interlayer bias
• Real-space imaging of the tailored plasmons in twisted bilayer graphene
• Optical Properties of Organometallic Perovskite: An ab initio Study using Relativistic GW Correction and Bethe-Salpeter Equation
• Gate-tunable nearly total terahertz absorption in graphene with resonant metal back reflector
• Electric Field Tunable Band Gap in Commensurate Twisted Bilayer Graphene
• Near-field thermal transport between twisted bilayer graphene
• Terahertz Circular Dichroism in Commensurate Twisted Bilayer Graphene
• Electron-phonon scattering and in-plane electric conductivity in twisted bilayer graphene
• Twisted bilayer graphene: low-energy physics, electronic and optical properties
• Exciton swapping in a twisted graphene bilayer as a solid-state realization of a two-brane model
• Photon absorption in twisted bilayer graphene
• Controlling quantum spin Hall state via strain in various stacking bilayer phosphorene