Electron-phonon coupling in a magic-angle twisted-bilayer graphene device
arXiv:2110.14916 · doi:10.1021/acs.nanolett.2c00905
Abstract
The importance of phonons in the strong correlation phenomena observed in twisted bilayer graphene (TBG) at the so-called magic-angle is under debate. Here we apply gate-dependent micro-Raman spectroscopy to monitor the G band linewidth in TBG devices of twist angles , (magic-angle) and (large angle). The results show a broad and p/n-asymmetric doping behavior at the magic-angle, in clear contrast to the behavior observed in twist angles above and below. Atomistic modeling reproduces the experimental observations, revealing how the unique electronic structure of magic-angle TBGs influences the electron-phonon coupling and, consequently, the G band linewidth. Our findings indicate a connection between electron-phonon coupling and experimental observations of strongly correlated phenomena in magic-angle TBG.
5 pages, 3 figures, submitted
References in corpus (14)
- Optical Separation of Mechanical Strain from Charge Doping in Graphene
- Non-adiabatic Kohn-anomaly in a doped graphene monolayer
- Phonon anharmonicities in graphite and graphene
- Phonon Linewidths and Electron Phonon Coupling in Nanotubes
- Electronic Transport in Dual-gated Bilayer Graphene at Large Displacement Fields
- Electron-Phonon Interactions in Graphene, Bilayer Graphene, and Graphite
- Observation of Anomalous Phonon Softening in Bilayer Graphene
- Band structure and insulating states driven by the Coulomb interaction in twisted bilayer graphene
- Coulomb interaction, phonons, and superconductivity in twisted bilayer graphene
- Dichotomy of Electron-Phonon Coupling in Graphene Moiré Flat Bands
- Electronic localization in small-angle twisted bilayer graphene
- Does filling-dependent band renormalization aid pairing in twisted bilayer graphene?
- The limits of Near Field Immersion Microwave Microscopy evaluated by imaging bilayer graphene Moiré patterns
- Raman spectra of twisted bilayer graphene close to the magic angle