Large linear-in-temperature resistivity in twisted bilayer graphene

article Large linear-in-temperature resistivity in twisted bilayer graphene published yes Hryhoriy Polshyn author edfc7cb1-526e-11ec-b05a-e6ecc27e4e480000-0001-8223-8896 Matthew Yankowitz author Shaowen Chen author Yuxuan Zhang author K. Watanabe author T. Taniguchi author Cory R. Dean author Andrea F. Young author Twisted bilayer graphene has recently emerged as a platform for hosting correlated phenomena. For twist angles near θ ≈ 1.1°, the low-energy electronic structure of twisted bilayer graphene features isolated bands with a flat dispersion1,2. Recent experiments have observed a variety of low-temperature phases that appear to be driven by electron interactions, including insulating states, superconductivity and magnetism3,4,5,6. Here we report electrical transport measurements up to room temperature for twist angles varying between 0.75° and 2°. We find that the resistivity, ρ, scales linearly with temperature, T, over a wide range of T before falling again owing to interband activation. The T-linear response is much larger than observed in monolayer graphene for all measured devices, and in particular increases by more than three orders of magnitude in the range where the flat band exists. Our results point to the dominant role of electron–phonon scattering in twisted bilayer graphene, with possible implications for the origin of the observed superconductivity. Springer Nature2019 eng general physics and astronomy Nature Physics 1745-2473 1745-2481 1902.0076310.1038/s41567-019-0596-3 15101011-1016 yes Polshyn H, Yankowitz M, Chen S, Zhang Y, Watanabe K, Taniguchi T, Dean CR, Young AF. 2019. Large linear-in-temperature resistivity in twisted bilayer graphene. Nature Physics. 15(10), 1011–1016. Polshyn, H., Yankowitz, M., Chen, S., Zhang, Y., Watanabe, K., Taniguchi, T., … Young, A. F. (2019). Large linear-in-temperature resistivity in twisted bilayer graphene. Nature Physics. Springer Nature. <a href="https://doi.org/10.1038/s41567-019-0596-3">https://doi.org/10.1038/s41567-019-0596-3</a> Polshyn, Hryhoriy, Matthew Yankowitz, Shaowen Chen, Yuxuan Zhang, K. Watanabe, T. Taniguchi, Cory R. Dean, and Andrea F. Young. “Large Linear-in-Temperature Resistivity in Twisted Bilayer Graphene.” Nature Physics. Springer Nature, 2019. <a href="https://doi.org/10.1038/s41567-019-0596-3">https://doi.org/10.1038/s41567-019-0596-3</a>. H. Polshyn et al., “Large linear-in-temperature resistivity in twisted bilayer graphene,” Nature Physics, vol. 15, no. 10. Springer Nature, pp. 1011–1016, 2019. Polshyn H, Yankowitz M, Chen S, et al. Large linear-in-temperature resistivity in twisted bilayer graphene. Nature Physics. 2019;15(10):1011-1016. doi:<a href="https://doi.org/10.1038/s41567-019-0596-3">10.1038/s41567-019-0596-3</a> H. Polshyn, M. Yankowitz, S. Chen, Y. Zhang, K. Watanabe, T. Taniguchi, C.R. Dean, A.F. Young, Nature Physics 15 (2019) 1011–1016. Polshyn, Hryhoriy, et al. “Large Linear-in-Temperature Resistivity in Twisted Bilayer Graphene.” Nature Physics, vol. 15, no. 10, Springer Nature, 2019, pp. 1011–16, doi:<a href="https://doi.org/10.1038/s41567-019-0596-3">10.1038/s41567-019-0596-3</a>. 106212022-01-13T15:00:58Z2022-01-20T09:33:38Z