English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Carrier transport theory for twisted bilayer graphene in the metallic regime

MPS-Authors
There are no MPG-Authors in the publication available
External Resource
No external resources are shared
Fulltext (public)

2003.00018.pdf
(Preprint), 6MB

Supplementary Material (public)
There is no public supplementary material available
Citation

Sharma, G., Yudhistira, I., Chakraborty, N., Ho, D. Y. H., Ezzi, M. M. A., Fuhrer, M. S., et al. (2021). Carrier transport theory for twisted bilayer graphene in the metallic regime. Nature Communications, 12(1): 5737. doi:10.1038/s41467-021-25864-1.


Cite as: http://hdl.handle.net/21.11116/0000-0009-6B1C-1
Abstract
The mechanisms responsible for the strongly correlated insulating and superconducting phases in twisted bilayer graphene are still debated. The authors provide a theory for phonon-dominated transport that explains several experimental observations, and contrast it with the Planckian dissipation mechanism. 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.