Magic angle in thermal conductivity of twisted bilayer graphene
arXiv:2301.00323 · doi:10.1016/j.mtphys.2023.101093
Abstract
We report a local minimum in thermal conductivity in twisted bilayer graphene (TBG) at the angle of 1.08, which corresponds to the 'magic angle' in the transition of several other reported properties. Within the supercell of a moiré lattice, different stacking modes generate phonon scattering sites which reduce the thermal conductivity of TBG. The thermal magic angle arises from the competition between the delocalization of atomic vibrational amplitudes and stresses on one hand, and the increased AA stacking density on the other hand. The former effect weakens the scattering strength of a single scatterer while the latter one increases the density of scatterers. The combination of these two effects eventually leads to the apparition of the highlighted irregularity in heat conduction. The manifestation of a magic angle, disclosing new thermal mechanisms at nanoscale, further uncovers the unique physics of two-dimensional materials.
15 pages, 5 figures
References in corpus (5)
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Cited by in corpus (6)
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- Twist-Dependent Anisotropic Thermal Conductivity in Homogeneous MoS Stacks
- Moiré-Driven Interfacial Thermal Transport in Twisted Transition Metal Dichalcogenides
- Phonon heat conduction across slippery interfaces in twisted graphite
- Low-temperature thermal transport in moiré superlattices
- Predicting the Thermal Conductivity Collapse in SWCNT Bundles: The Interplay of Symmetry Breaking and Scattering Revealed by Machine-Learning-Driven Quantum Transport