Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session S11: Topology and Correlations in Non-Moiré Graphene Systems
8:00 AM–10:36 AM,
Thursday, March 7, 2024
Room: M100B
Sponsoring
Unit:
DCMP
Chair: Long Ju, Massachusetts Institute of Technology
Abstract: S11.00009 : Localized defect states within the bands of bilayer graphene*
9:36 AM–9:48 AM
Presenter:
Justin H Wilson
(Louisiana State University)
Authors:
Justin H Wilson
(Louisiana State University)
Daniel Massatt
(Louisiana State University)
Stephen Shipman
(Louisiana State University)
Ilya Vekhter
(Louisiana State University)
Band structure engineering is crucial for creating materials that can host robust topological edge states, defect states, and correlated phases. This study unveils a remarkable new phenomenon: defect states in periodic systems that coexist within but separate from the continuum, specifically within Bernal stacked graphene. With the application of a localized potential, these states are localized and share energy with continuum states yet arise from fundamental algebraic conditions rather than system symmetries or topology. This is in contrast to AA-stacked graphene, where symmetries can give rise to such states, revealing that the Bernal-stacked case has a distinct, intriguing mechanism. These defect states, immune to energy-matching scattering, hold promise for a new avenue in band structure engineering.
*We acknowledge support from the National Science Foundation under Grants No. DMR-223889 (JW) and National Science Foundation Grant No. DMS-2206037 (SS).
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