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

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 experimenta...

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Published in:Nano letters 2021-02, Vol.21 (3), p.1221-1227
Main Authors: Jayaraman, Aditya, Hsieh, Kimberly, Ghawri, Bhaskar, Mahapatra, Phanibhusan S, Watanabe, Kenji, Taniguchi, Takashi, Ghosh, Arindam
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cited_by cdi_FETCH-LOGICAL-a348t-ed6b40ef9884350433f54ec153fe4579a05c9245d48760883a11c8c361fff44b3
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container_end_page 1227
container_issue 3
container_start_page 1221
container_title Nano letters
container_volume 21
creator Jayaraman, Aditya
Hsieh, Kimberly
Ghawri, Bhaskar
Mahapatra, Phanibhusan S
Watanabe, Kenji
Taniguchi, Takashi
Ghosh, Arindam
description 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 (∼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.
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title Evidence of Lifshitz Transition in the Thermoelectric Power of Ultrahigh-Mobility Bilayer Graphene
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