Enhanced hydrodynamic transport in near magic angle twisted bilayer graphene
Abstract
Using the semiclassical quantum Boltzmann theory and employing the Dirac model with twist angle-dependent Fermi velocity, we obtain results for the electrical resistivity, the electronic thermal resistivity, the Seebeck coefficient, and the Wiedemann-Franz ratio in near magic angle twisted bilayer graphene, as functions of doping density (around the charge-neutrality point) and modified Fermi velocity $$\tilde{v}$$. The $$\tilde{v}$$ dependence of the relevant scattering mechanisms, i.e., electron-hole Coulomb, long-range impurities, and acoustic gauge phonons, is considered in detail. We find a range of twist angles and temperatures, where the combined effect of momentum-nonconserving collisions (long-range impurities and phonons) is minimal, opening a window for the observation of strong hydrodynamic transport. In this work, several experimental signatures are identified, such as a sharp dependence of the electric resistivity on doping density and a large enhancement of the Wiedemann-Franz ratio and the Seebeck coefficient.
- Authors:
-
[3];
- Univ. of Missouri, Columbia, MO (United States)
- Yale-NUS College (Singapore)
- Yale-NUS College (Singapore); National Univ. of Singapore (Singapore)
- Univ. of Missouri, Columbia, MO (United States); Yale-NUS College (Singapore); National Univ. of Singapore (Singapore)
- Publication Date:
- Research Org.:
- Univ. of Missouri, Columbia, MO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); Singapore Ministry of Education (MoE)
- OSTI Identifier:
- 1800312
- Grant/Contract Number:
- FG02-05ER46203; MOE2017-T2-2-140; MOE2017-T2-1-130; R-607-000-094-133
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 101; Journal Issue: 4; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Materials Science; Physics
Citation Formats
Zarenia, Mohammad, Yudhistira, Indra, Adam, Shaffique, and Vignale, Giovanni. Enhanced hydrodynamic transport in near magic angle twisted bilayer graphene. United States: N. p., 2020.
Web. doi:10.1103/physrevb.101.045421.
Zarenia, Mohammad, Yudhistira, Indra, Adam, Shaffique, & Vignale, Giovanni. Enhanced hydrodynamic transport in near magic angle twisted bilayer graphene. United States. https://doi.org/10.1103/physrevb.101.045421
Zarenia, Mohammad, Yudhistira, Indra, Adam, Shaffique, and Vignale, Giovanni. Fri .
"Enhanced hydrodynamic transport in near magic angle twisted bilayer graphene". United States. https://doi.org/10.1103/physrevb.101.045421. https://www.osti.gov/servlets/purl/1800312.
@article{osti_1800312,
title = {Enhanced hydrodynamic transport in near magic angle twisted bilayer graphene},
author = {Zarenia, Mohammad and Yudhistira, Indra and Adam, Shaffique and Vignale, Giovanni},
abstractNote = {Using the semiclassical quantum Boltzmann theory and employing the Dirac model with twist angle-dependent Fermi velocity, we obtain results for the electrical resistivity, the electronic thermal resistivity, the Seebeck coefficient, and the Wiedemann-Franz ratio in near magic angle twisted bilayer graphene, as functions of doping density (around the charge-neutrality point) and modified Fermi velocity $\tilde{v}$. The $\tilde{v}$ dependence of the relevant scattering mechanisms, i.e., electron-hole Coulomb, long-range impurities, and acoustic gauge phonons, is considered in detail. We find a range of twist angles and temperatures, where the combined effect of momentum-nonconserving collisions (long-range impurities and phonons) is minimal, opening a window for the observation of strong hydrodynamic transport. In this work, several experimental signatures are identified, such as a sharp dependence of the electric resistivity on doping density and a large enhancement of the Wiedemann-Franz ratio and the Seebeck coefficient.},
doi = {10.1103/physrevb.101.045421},
journal = {Physical Review B},
number = 4,
volume = 101,
place = {United States},
year = {Fri Jan 17 00:00:00 EST 2020},
month = {Fri Jan 17 00:00:00 EST 2020}
}
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