https://doi.org/10.1140/epjp/s13360-023-04815-3
Regular Article
Twist angle tuned electronic transport in narrow bands
1
Department of Physics, Kohat University of Science and Technology, 26000, Kohat, Khyber Pakhtunkhwa, Pakistan
2
Department of Physics, Quaid-i-Azam University, 45320, Islamabad, Pakistan
Received:
29
October
2023
Accepted:
20
December
2023
Published online:
3
January
2024
Electrical conductivity of Dirac fermions in narrow bands such as twisted bilayer graphene within the linear response theory is investigated. We find that the diagonal conductivity is finite; whereas, the Hall conductivity vanishes identically. The diagonal conductivity changes significantly by varying the band width, which can be tuned by the twist angle. In particular, the conductivity is maximal at the twist angle that matches the magic angle, where the twisted bilayer graphene exhibits a narrow band. This leads to enhanced density of states and electrical conductivity of Dirac fermions. In addition, it is shown that electrical conductivity decreases with the increase in temperature.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
