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• W2939909765 abstract "Recent experiments on twisted bilayer graphene (tBG) close to magic angle show that a small relative rotation in a van der Waals heterostructure greatly alters its electronic properties. We consider various scattering mechanisms and show that the carrier transport in tBG is dominated by a combination of charged impurities and acoustic gauge phonons. Charged impurities still dominate at low temperature and densities because of the inability of Dirac fermions to screen long-range Coulomb potentials at charge neutrality; however, the gauge phonons dominate for most of the experimental regime because, although they couple to current, they do not induce charge and are therefore unscreened by the large density of states close to magic angle. We show that the resistivity has a strong monotonically decreasing carrier density dependence at low temperature due to charged impurity scattering, and weak density dependence at high temperature due to gauge phonons. Away from charge neutrality, the resistivity increases with temperature, while it does the opposite close to the Dirac point. A nonmonotonic temperature dependence observed only at low temperature and carrier density is a signature of our theory that can be tested in experimentally available samples." @default.
• W2939909765 created "2019-04-25" @default.
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• W2939909765 date "2019-04-17" @default.
• W2939909765 modified "2023-10-17" @default.
• W2939909765 title "Gauge-phonon dominated resistivity in twisted bilayer graphene near magic angle" @default.
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• W2939909765 doi "https://doi.org/10.1103/physrevb.99.140302" @default.
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