Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session N56: Twisted Bilayer Graphene: Theory, Transport, Thermodynamics, and Optics
11:30 AM–2:18 PM,
Wednesday, March 16, 2022
Room: Hyatt Regency Hotel -Burnham
Sponsoring
Unit:
DCMP
Chair: Xiaomeng Liu, Princeton University
Abstract: N56.00012 : Interaction driven giant thermopower in magic-angle twisted bilayer graphene
1:42 PM–1:54 PM
Presenter:
Anindya Das
(Indian Institute of Science Bangalore)
Authors:
Anindya Das
(Indian Institute of Science Bangalore)
Arup K Paul
(Indian Institute of Science Bangalore)
AYAN GHOSH
(Indian Institute of Science Bangalore)
Kenji Watanabe
(NIMS, Japan)
Takashi Taniguchi
(NIMS. Japan)
Sumilan Banerjee
(Indian Institute of Science Bangalore)
Subroto Mukerjee
(Indian Institute of Science Bangalore)
Adhip Agarwala
(Tata Institute of Fundamental Research (TIFR))
Souvik Chakraborty
(Indian Institute of Science)
Ujjal Roy
(Indian Institute of Science)
Ranit Dutta
(Indian Institute of Science)
Animesh Panda
(Indian Institute of Science)
to realize and study a host of emergent quantum phases arising from the strong correlations in
its narrow bandwidth flat band. In this regard, thermal transport phenomena like thermopower, in
addition to being coveted technologically, is also sensitive to the particle-hole (PH) asymmetry, making
it a crucial tool to probe the underlying electronic structure of this material. We have carried
out thermopower measurements of MtBLG as a function of carrier density, temperature and magnetic
field, and report the observation of an unusually large thermopower reaching up to a value as
high as ~100μV/K at a low temperature of 1K. Surprisingly, our observed thermopower exhibits
peak-like features in close correspondence to the resistance peaks around the integer Moire fillings,
including the Dirac Point, violates the Mott formula. We show that the large thermopower peaks and
their associated behaviour arise from the emergent highly PH asymmetric electronic structure due to
the cascade of Dirac revivals. Furthermore, the thermopower shows an anomalous peak around the
superconducting transition on the hole side and points towards the possible role of enhanced superconducting
fluctuations in MtBLG.
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