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 Y21: Moire Beyond Graphene III
8:00 AM–10:48 AM,
Friday, March 10, 2023
Room: Room 213
Sponsoring
Unit:
DCMP
Chair: Thomas Heinzel, University of Dusseldorf
Abstract: Y21.00003 : Boundary Modes from Periodic Magnetic and Pseudomagnetic Fields in Graphene*
8:24 AM–8:36 AM
Presenter:
Phong T Vo
(University of Pennsylvania)
Authors:
Phong T Vo
(University of Pennsylvania)
Eugene J Mele
(University of Pennsylvania)
Single-layer graphene subject to periodic lateral strains is an artificial crystal that can support boundary spectra with an intrinsic polarity. This is analyzed by comparing the effects of periodic magnetic fields and strain-induced pseudomagnetic fields that, respectively, break and preserve time-reversal symmetry. In the former case, a Chern classification of the superlattice minibands with zero total magnetic flux enforces single counterpropagating modes traversing each bulk gap on opposite boundaries of a nanoribbon. For the pseudomagnetic field, pairs of counterpropagating modes migrate to the same boundary where they provide well-developed valley-helical transport channels on a single zigzag edge. We discuss possible schemes for implementing this situation and their experimental signatures.
*Support by the Department of Energy under grant number DE-FG02-84ER45118, by the NSF Graduate Research Fellowships Program, and by the P.D. Soros Fellowship for New Americans is acknowledged.
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