Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session W17: Topological Materials and Platforms
3:00 PM–5:48 PM,
Thursday, March 7, 2024
Room: M100H
Sponsoring
Unit:
DCMP
Chair: Qunfei Zhou, University of Kansas
Abstract: W17.00014 : Higher-Order Van Hove Singularities on Moir'e Surface States of Topological Insulators*
5:36 PM–5:48 PM
Presenter:
Lakshmi Pullasseri Madom Narayana Iyer
(Emory University)
Authors:
Lakshmi Pullasseri Madom Narayana Iyer
(Emory University)
Luiz H Santos
(Emory University)
Three-dimensional topological insulators (TIs) are bulk insulators with exotic metallic surface states that host symmetry-protected 2D Dirac fermions. Recent experiments have demonstrated the formation of Moir'e superlattices that renormalize the velocity of the low energy Dirac excitations on the 3D TI surface, thus promoting the formation of exotic many-body states. Here, we investigate the effects of Moir'e superlattices on the topological surface states using a continuum model of Dirac fermions in a periodic potential and Zeeman field. We find a low-energy Chern band supporting tunable higher-order Van Hove singularities (HOVHS) for a manifold of superlattice potential and Zeeman field strengths which obey a scaling relation. An effective tight-binding model is also studied to gain a better understanding of the formation of the HOVHS in the Moir'e bandstructure. This framework opens a new path to explore interaction effects on the surface of TI.
*This work is supported by the DOE-BES award DE-SC0023327.
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