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Misorientation-Controlled Cross-Plane Thermoelectricity in Twisted Bilayer Graphene

Mahapatra, PS and Ghawri, B and Garg, M and Mandal, S and Watanabe, K and Taniguchi, T and Jain, M and Mukerjee, S and Ghosh, A (2020) Misorientation-Controlled Cross-Plane Thermoelectricity in Twisted Bilayer Graphene. In: Physical Review Letters, 125 (22).

Full text not available from this repository.
Official URL: https://doi.org/10.1103/PhysRevLett.125.226802

Abstract

The introduction of "twist"or relative rotation between two atomically thin van der Waals membranes gives rise to periodic moiré potential, leading to a substantial alteration of the band structure of the planar assembly. While most of the recent experiments primarily focus on the electronic-band hybridization by probing in-plane transport properties, here we report out-of-plane thermoelectric measurements across the van der Waals gap in twisted bilayer graphene, which exhibits an interplay of twist-dependent interlayer electronic and phononic hybridization. We show that at large twist angles, the thermopower is entirely driven by a novel phonon-drag effect at subnanometer scale, while the electronic component of the thermopower is recovered only when the misorientation between the layers is reduced to <6°. Our experiment shows that cross-plane thermoelectricity at low angles is exceptionally sensitive to the nature of band dispersion and may provide fundamental insights into the coherence of electronic states in twisted bilayer graphene. © 2020 American Physical Society.

Item Type: Journal Article
Publication: Physical Review Letters
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to the Author(s).
Keywords: Thermoelectric power; Thermoelectric power plants; Thermoelectricity; Van der Waals forces, Band dispersions; Electronic band; Electronic component; Mis-orientation; Phonon drag effects; Relative rotation; Thermoelectric measurements; Twisted bilayers, Graphene
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 10 Jan 2023 06:51
Last Modified: 10 Jan 2023 06:51
URI: https://eprints.iisc.ac.in/id/eprint/79001

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