Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session S09: Topology in Twisted Multilayer Graphene
8:00 AM–11:00 AM,
Thursday, March 7, 2024
Room: L100J
Sponsoring
Unit:
DCMP
Chair: Enrique Munoz, Pontificia Universidad Catolica de Chile
Abstract: S09.00004 : A novel technique to extract features of flat bands in a moiré Superlattice*
8:36 AM–8:48 AM
Presenter:
Jin Jiang
(EPFL PHB-ECUBLENS)
Author:
Jin Jiang
(EPFL PHB-ECUBLENS)
Collaboration:
Jin Jiang, Cheng Shen, Zekang Zhou, Mario Di luca, Emily Hajigeorgiou,
Kenji Watanabe, Takashi Taniguchi, Mitali Banerjee
Abstract: Twisted multilayer graphene systems with nearly flat bands are ideal platforms for studying strongly correlated physics. Exotic phases of matter such as correlated insulators at integer fillings, superconductivity, and anomalous quantum hall have been observed in such systems. However, a straightforward technique to directly extract detailed flat band features is still lacking. We propose a novel technique for the study of flat bands using a decoupled monolayer graphene on a magic-angle twisted monolayer bilayer graphene heterostructure. We not only extract the width of the flat bands by measuring the chemical potentials, but also directly map the evolution of the electron-electron correlation as a function of the external displacement field. Through our measurements, we observe that the correlation maximizes where the flat band width is minimum. This new device configuration with an additional decoupled monolayer graphene can pave a way to study the flat bands which can further improve the understanding of the electronic band structure.
*M.B. acknowledges the support of SNSF Eccellenza grant No. PCEGP2_194528, and support from the QuantERA II Programme that has received funding from the European Union's Horizon 2020 research and inno- vation program under Grant Agreement No 101017733.
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