Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session N23: Electronic structure of topological materials (photoemission, etc.)-I
11:30 AM–2:18 PM,
Wednesday, March 8, 2023
Room: Room 215
Sponsoring
Unit:
DCMP
Chair: Azel Murzabekova, University of Illinois at Urbana-Champaign
Abstract: N23.00006 : Unremovable linked nodal structures in stacked bilayer graphene with Kekulé texture*
12:30 PM–12:42 PM
Presenter:
Chiranjit Mondal
(Soul National University)
Author:
Chiranjit Mondal
(Soul National University)
We propose a new type of a linked nodal structure between a nodal line (nodal surface) at EF with another nodal line (nodal surface) below EF in two-dimensional (three-dimensional) systems with two chiral symmetries and negligible spin-orbit coupling. Contrary to the cases of linked nodes reported previously, in our system, a double band inversion creates a pair of linked nodes carrying the same topological charges, thus the pair are unremovable via a Lifshiftz transition. A realistic tight binding model and effective theory are developed for such a linking structure, and also a class of candidate materials are predicted using density functional theory (DFT) calculations. Experimental aspect of the proposed theory and predicted compounds are also discussed.
*We are supported by the Institute for Basic Science in Korea (Grant No. IBSR009-D1), Samsung Science and Technology Foundation under Project No. SSTF-BA2002-06, and a National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIT) (No. 2021R1A2C4002773 and No. NRF-2021R1A5A1032996).
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