Enhanced hydrodynamic transport in near magic angle twisted bilayer graphene

Zarenia, Mohammad; Yudhistira, Indra; Adam, Shaffique; Vignale, Giovanni

doi:10.1103/physrevb.101.045421

Enhanced hydrodynamic transport in near magic angle twisted bilayer graphene

Journal Article · Fri Jan 17 00:00:00 EST 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.101.045421· OSTI ID:1800312

Zarenia, Mohammad ^[1]; Yudhistira, Indra ^[2]; ^[3]; Vignale, Giovanni ^[4]

Univ. of Missouri, Columbia, MO (United States); OSTI
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)

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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Missouri, Columbia, MO (United States)

Sponsoring Organization:: Singapore Ministry of Education (MoE); USDOE Office of Science (SC)

Grant/Contract Number:: FG02-05ER46203

OSTI ID:: 1800312

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 4 Vol. 101; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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