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Misorientation-controlled cross-plane thermoelectricity in twisted bilayer graphene
Physical Review Letters ( IF 8.385 ) Pub Date : 
Phanibhusan S. Mahapatra; Bhaskar Ghawri; Manjari Garg; Shinjan Mandal; K. Watanabe; T. Taniguchi; Manish Jain; Subroto Mukerjee; Arindam Ghosh

Introduction of twist’ or relative rotation between two atomically thin van der Waals (vdW) membranes gives rise to periodic Moir'{e} 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 (tBLG), which exhibits an interplay of twist-dependent inter-layer electronic and phononic hybridization. We show that at large twist angle, the thermopower is entirely driven by a novel phonon drag effect at sub-nanometer scale, while the electronic component of the thermopower is recovered only when the mis-orientation between the layers is reduced to $
更新日期:2020-10-15

 

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