1. Unconventional surface state pairs in a high-symmetry lattice with anti-ferromagnetic band-folding
- Author
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Lin-Lin Wang, Junyeong Ahn, Robert-Jan Slager, Yevhen Kushnirenko, Benjamin G. Ueland, Aashish Sapkota, Benjamin Schrunk, Brinda Kuthanazhi, Robert J. McQueeney, Paul C. Canfield, and Adam Kaminski
- Subjects
Astrophysics ,QB460-466 ,Physics ,QC1-999 - Abstract
Abstract Many complex magnetic structures in a high-symmetry lattice can arise from a superposition of well-defined magnetic wave vectors. These “multi-q” structures have garnered much attention because of interesting real-space spin textures such as skyrmions. However, the role multi-q structures play in the topology of electronic bands in momentum space has remained rather elusive. Here we show that the type-I anti-ferromagnetic 1q, 2q and 3q structures in an face-centered cubic sublattice with band inversion, such as NdBi, can induce unconventional surface state pairs inside the band-folding hybridization bulk gap. Our density functional theory calculations match well with the recent experimental observation of unconventional surface states with hole Fermi arc-like features and electron pockets below the Neel temperature. We further show that these multi-q structures have Dirac and Weyl nodes. Our work reveals the special role that band-folding from anti-ferromagnetism and multi-q structures can play in developing new types of surface states.
- Published
- 2023
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