Misorientation-Controlled Cross-Plane Thermoelectricity in Twisted Bilayer Graphene

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 electro...

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Bibliographic Details
Published in:Physical review letters 2020-11, Vol.125 (22), p.226802-226802, Article 226802
Main Authors: Mahapatra, Phanibhusan S, Ghawri, Bhaskar, Garg, Manjari, Mandal, Shinjan, Watanabe, K, Taniguchi, T, Jain, Manish, Mukerjee, Subroto, Ghosh, Arindam
Format: Article
Language:English
Subjects:
Bilayers
Electron states
Electronic components
Graphene
Interlayers
Misalignment
Thermoelectricity
Transport properties
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Summary: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
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.125.226802