Carrier transport theory for twisted bilayer graphene in the metallic regime

Gargee Sharma, Indra Yudhistira, Nilotpal Chakraborty, Derek Y. H. Ho, M. M. Al Ezzi, Michael S. Fuhrer, Giovanni Vignale and Shaffique Adam ()
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Gargee Sharma: National University of Singapore
Indra Yudhistira: National University of Singapore
Nilotpal Chakraborty: National University of Singapore
Derek Y. H. Ho: National University of Singapore
M. M. Al Ezzi: National University of Singapore
Michael S. Fuhrer: Monash University
Giovanni Vignale: National University of Singapore
Shaffique Adam: National University of Singapore

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract Understanding the normal-metal state transport in twisted bilayer graphene near magic angle is of fundamental importance as it provides insights into the mechanisms responsible for the observed strongly correlated insulating and superconducting phases. Here we provide a rigorous theory for phonon-dominated transport in twisted bilayer graphene describing its unusual signatures in the resistivity (including the variation with electron density, temperature, and twist angle) showing good quantitative agreement with recent experiments. We contrast this with the alternative Planckian dissipation mechanism that we show is incompatible with available experimental data. An accurate treatment of the electron-phonon scattering requires us to go well beyond the usual treatment, including both intraband and interband processes, considering the finite-temperature dynamical screening of the electron-phonon matrix element, and going beyond the linear Dirac dispersion. In addition to explaining the observations in currently available experimental data, we make concrete predictions that can be tested in ongoing experiments.

Date: 2021
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DOI: 10.1038/s41467-021-25864-1

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