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Evidence of Lifshitz Transition in the Thermoelectric Power of Ultrahigh-Mobility Bilayer Graphene

Jayaraman, A and Hsieh, K and Ghawri, B and Mahapatra, PS and Watanabe, K and Taniguchi, T and Ghosh, A (2021) Evidence of Lifshitz Transition in the Thermoelectric Power of Ultrahigh-Mobility Bilayer Graphene. In: Nano Letters, 21 (03). pp. 1221-1227.

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Official URL: https://doi.org/10.1021/acs.nanolett.0c03586


Resolving low-energy features in the density of states (DOS) holds the key to understanding a wide variety of rich novel phenomena in graphene-based 2D heterostructures. The Lifshitz transition in bilayer graphene (BLG) arising from trigonal warping has been established theoretically and experimentally. Nevertheless, the experimental realization of its effects on transport properties has been challenging because of its relatively low energy scale (â 1 meV). In this work, we demonstrate that the thermoelectric power (TEP) can be used as an effective probe to investigate fine changes in the DOS of BLG. We observed additional entropy features in the vicinity of the charge neutrality point (CNP) in gapped BLG. This apparent violation of the Mott formula can be explained quantitatively by considering the effects of trigonal warping, thereby serving as possible evidence of a Lifshitz transition. © 2020 American Chemical Society. All rights reserved.

Item Type: Journal Article
Publication: Nano Letters
Publisher: American Chemical Society
Additional Information: The copyrights of the article belong to the author.
Keywords: Thermoelectric power plants, Bilayer Graphene; Charge neutrality; Density of state; Energy feature; Energy scale; Experimental realizations; Lifshitz transition, Graphene
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 22 Dec 2021 10:30
Last Modified: 22 Dec 2021 10:30
URI: http://eprints.iisc.ac.in/id/eprint/68119

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