Moiré phonons in graphene/hexagonal boron nitride moiré superlattice
arXiv:2210.03381 · doi:10.1103/PhysRevB.107.115301
Abstract
We theoretically study in-plane acoustic phonons of graphene/hexagonal boron nitride moiré superlattice by using a continuum model. We demonstrate that the original phonon bands of individual layers are strongly hybridized and reconstructed into moiré phonon bands consisting of dispersive bands and flat bands. The phonon band structure can be effectively described by a spring-mass network model to simulate the motion of moiré domain walls, where the flat-band modes are interpreted as vibrations of independent, decoupled strings. We also show that the moiré phonon has angular momentum due to the inversion symmetry breaking by hBN, with high amplitudes concentrated near narrow gap region. Finally, we apply the same approach to twisted bilayer graphene, and we find a notable difference between the origins of the flat-band modes in G/hBN and TBG, reflecting distinct geometric structures of domain pattern.
15 pages, 11 figures
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Cited by in corpus (9)
- Anomalous Hall Crystals in Rhombohedral Multilayer Graphene I: Interaction-Driven Chern Bands and Fractional Quantum Hall States at Zero Magnetic Field
- Multi-scale lattice relaxation in general twisted trilayer graphenes
- Flat-band optical phonons in twisted bilayer graphene
- Moiré optical phonons dancing with heavy electrons in magic-angle twisted bilayer graphene
- Flat and tunable moire phonons in twisted transition-metal dichalcogenides
- Electrons surf phason waves in moiré bilayers
- Low-temperature thermal transport in moiré superlattices
- Decomposing Electronic Structures in Twisted Multilayers: Bridging Spectra and Incommensurate Wave Functions
- One-dimensional moiré engineering in zigzag graphene nanoribbons on hBN