Cascades in transport and optical conductivity of Twisted Bilayer Graphene
arXiv:2412.20855 · doi:10.1103/nhs2-mbhr
Abstract
Using a combined Dynamical Mean Field Theory and Hartree (DMFT+H) calculation we study the transport and optical properties of the 8-band heavy fermion model for Twisted Bilayer Graphene (TBG) in the normal state. We find resistive states around integer fillings which resemble the ones observed in transport experiments. From a Drude fitting of the low frequency optical conductivity, we extract a very strongly doping-dependent Drude weight and scattering rate, resetting at the integers. For most dopings, particularly above the integers, the Drude scattering rate is high but notably smaller than that of the local electrons. This highlights the important role of itinerant electrons in the transport properties, despite their limited spectral weight on the flat bands. At far infrared frequencies, the optical conductivity exhibits cascades characterized by highly asymmetric resets of the intensity and oscillations in the interband peak frequencies.
7 pages article including 3 multiple figures + 6 pages Supplementary Information including 5 multiple figures
References in corpus (29)
- Continuous-time Monte Carlo methods for quantum impurity models
- Electrodynamics of Correlated Electron Materials
- Quantum Monte Carlo Impurity Solver for Cluster DMFT and Electronic Structure Calculations in Adjustable Base
- Lattice relaxation and energy band modulation in twisted bilayer graphenes
- MATBG as Topological Heavy Fermion: I. Exact Mapping and Correlated Insulators
- Entropic evidence for a Pomeranchuk effect in magic angle graphene
- Band structure and insulating states driven by the Coulomb interaction in twisted bilayer graphene
- The Quantum Twisting Microscope
- Cascades between light and heavy fermions in the normal state of magic angle twisted bilayer graphene
- Kondo lattice model in magic-angle twisted bilayer graphene
- Spectroscopy Signatures of Electron Correlations in a Trilayer Graphene/hBN Moiré Superlattice
- Heavy fermion representation for twisted bilayer graphene systems
- Kondo Lattice Model of Magic-Angle Twisted-Bilayer Graphene: Hund's Rule, Local-Moment Fluctuations, and Low-Energy Effective Theory
- Theory of correlated insulators and superconductivity in twisted bilayer graphene
- Heavy quasiparticles and cascades without symmetry breaking in twisted bilayer graphene
- Interactions in the 8-orbital model for twisted bilayer graphene
- Nano-photocurrent mapping of local electronic structure in twisted bilayer graphene
- Symmetric Kondo Lattice States in Doped Strained Twisted Bilayer Graphene
- Dynamical correlations and order in magic-angle twisted bilayer graphene
- Optical conductivity and Raman scattering of iron superconductors
- Kondo Phase in Twisted Bilayer Graphene -- A Unified Theory for Distinct Experiments
- Terahertz photocurrent probe of quantum geometry and interactions in magic-angle twisted bilayer graphene
- Time-reversal versus chiral symmetry breaking in twisted bilayer graphene
- Cascade of transitions in twisted and non-twisted graphene layers within the van Hove scenario
- On-Chip Terahertz Spectroscopy for Dual-Gated van der Waals Heterostructures at Cryogenic Temperatures
- Low-energy optical sum-rule in moiré graphene
- High-Harmonic Generation with a twist: all-optical characterization of magic-angle twisted bilayer graphene
- Thermopower probing emergent local moments in magic-angle twisted bilayer graphene
- Nonlocal Moments in the Chern Bands of Twisted Bilayer Graphene