Bibliographic Details
| Title: |
Magic angle in thermal conductivity of twisted bilayer graphene |
| Authors: |
Cheng, Yajuan, Fan, Zheyong, Zhang, Tao, Nomura, Masahiro, Volz, Sebastian, Zhu, Guimei, Li, Baowen, Xiong, Shiyun |
| Source: |
Materials Today Physics, 35 (2023) 101093 |
| Publication Year: |
2022 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science |
| More Details: |
We report a local minimum in thermal conductivity in twisted bilayer graphene (TBG) at the angle of 1.08$^\circ$, which corresponds to the 'magic angle' in the transition of several other reported properties. Within the supercell of a moir\'e 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.
Comment: 15 pages, 5 figures |
| Document Type: |
Working Paper |
| DOI: |
10.1016/j.mtphys.2023.101093 |
| Access URL: |
http://arxiv.org/abs/2301.00323 |
| Accession Number: |
edsarx.2301.00323 |
| Database: |
arXiv |
