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19 January 2025 |
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Article overview
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Magic angle in thermal conductivity of twisted bilayer graphene | | Yajuan Cheng
; Zheyong Fan
; Tao Zhang
; Masahiro Nomura
; Sebastian Volz
; Guimei Zhu
; Baowen Li
; Shiyun Xiong
; | | Date: |
1 Jan 2023 | | Abstract: | In this Letter, we report a magic angle of 1.08$^circ$ in the thermal
conductivity of twisted bilayer graphene (TBLG). Within the supercell of a
moir’{e} lattice, there exist sites with different staking modes between the
two graphene layers, which serve as scatterers for the phonons that reduce the
thermal conductivity of TBLG compared to that of untwisted bilayer graphene.
Our detailed study reveals that the thermal magic angle arises from the
competition between the weakened spatial dependence of vibrational amplitude
and stress on one hand, and the increased number of scattering sites on the
other hand. The rapid decrease of spatial mismatch for atomic vibrational
amplitudes and local stresses at small angles significantly weakens the
scattering strength of a single scatterer. In contrast, the reduced crystal
period with twist angle dramatically increases scatterer density. The
combination of the two effects eventually leads to the apparition of this
irregularity in heat conduction. Our work not only enriches the research of
twisted graphene, but also reveals the underlying physics of the thermal magic
angle, which should impact heat conduction in two-dimensional materials in
general. | | Source: | arXiv, 2301.00323 | | Services: | Forum | Review | PDF | Favorites | |
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