Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Q40: 2D Moiré Materials: Novel Fabrication and Materials
3:00 PM–5:48 PM,
Wednesday, March 8, 2023
Room: Room 232
Sponsoring
Unit:
DMP
Chair: Daniel Rhodes, University of Wisconsin - Madison; Shaowei Li, University of California, San Diego
Abstract: Q40.00005 : Chiral Charge Distribution near Domain Boundary in Twisted Bilayer Graphene Aligned with hexagonal Boron Nitride*
4:36 PM–4:48 PM
Presenter:
Xinyuan Lai
(Rutgers University)
Authors:
Xinyuan Lai
(Rutgers University)
Guohong Li
(Rutgers University, New Brunswick)
Kenji Watanabe
(National Institute for Materials Science)
Takashi Taniguchi
(National Institute for Materials Science)
Eva Y Andrei
(Rutgers University)
interaction-driven instabilities as the Fermi energy are swept through the band. Breaking
the sublattice symmetry by aligning the MATBG with hexagonal Boron Nitride (hBN),
endows the bands with a non-trivial Berry curvature, leading to the emergence of orbital
magnetism near filling of +3 (3 electrons per moire cell). Using scanning tunneling
microscopy and spectroscopy (STM/STS) on this system, we observe multiple domains
where the hBN and MATBG lattices are perfectly aligned despite their lattice mismatch.
The competition between the van der Waals energy gain from alignment and the energy
cost of strain accumulation, leads to 1D domain boundaries (DB) where the alignment is
disrupted. STS maps of the domains and DBs around filling +3 reveal a charge
redistribution that depends on doping, on magnetic field, and displays strong hysteresis.
The DOS maps and associated charge distribution map reveal that in the presence of a
magnetic field the charge distribution is chiral, and that removing the field preserves the
chirality. Furthermore, reversing the field orientation reverses the chirality. These results
which can be attributed to orbital magnetism of the +3 state, suggest that the DB may host
the 1D chiral states responsible for the anomalous QHE observed in transport.
*Work supported by the US Department of Energy DOE-FG02-99ER45742; the Gordon and Betty Moore Foundation EPiQS initiative grant GBMF9453
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