Emergence of Fermi arcs due to magnetic splitting in an antiferromagnet

Date
2022-03-23
Authors
Schrunk,, Benjamin
Kushnirenko, Yevhen
Kuthanazhi, Brinda
Ahn, Junyeong
Wang, Lin-Lin
O'Leary, Evan
Lee, Kyungchan
Eaton, Andrew
Fedorov, Alexander
Lou, Rui
Voroshnin, Vladimir
Clark, Oliver J.
Sanchez-Barriga, Jaime
Bud'ko, Sergey L.
Slager, Robert-Jan
Canfield, Paul
Kaminski, Adam
Canfield, Paul
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Springer Nature
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Physics and Astronomy
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Ames Laboratory
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Physics and AstronomyAmes Laboratory
Abstract
The Fermi surface plays an important role in controlling the electronic, transport and thermodynamic properties of materials. As the Fermi surface consists of closed contours in the momentum space for well-defined energy bands, disconnected sections known as Fermi arcs can be signatures of unusual electronic states, such as a pseudogap1. Another way to obtain Fermi arcs is to break either the time-reversal symmetry2 or the inversion symmetry3 of a three-dimensional Dirac semimetal, which results in formation of pairs of Weyl nodes that have opposite chirality4, and their projections are connected by Fermi arcs at the bulk boundary3,5,6,7,8,9,10,11,12. Here, we present experimental evidence that pairs of hole- and electron-like Fermi arcs emerge below the Neel temperature (TN) in the antiferromagnetic state of cubic NdBi due to a new magnetic splitting effect. The observed magnetic splitting is unusual, as it creates bands of opposing curvature, which change with temperature and follow the antiferromagnetic order parameter. This is different from previous theoretically considered13,14 and experimentally reported cases15,16 of magnetic splitting, such as traditional Zeeman and Rashba, in which the curvature of the bands is preserved. Therefore, our findings demonstrate a type of magnetic band splitting in the presence of a long-range antiferromagnetic order that is not readily explained by existing theoretical ideas.
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This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at DOI: 10.1038/s41586-022-04412-x. Copyright 2022 The Author(s). Posted with permission.
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