Spanning Fermi arcs in a two-dimensional magnet

Ying-Jiun Chen (), Jan-Philipp Hanke, Markus Hoffmann, Gustav Bihlmayer, Yuriy Mokrousov, Stefan Blügel, Claus M. Schneider and Christian Tusche ()
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Ying-Jiun Chen: Peter Grünberg Institut, Forschungszentrum Jülich
Jan-Philipp Hanke: Peter Grünberg Institut, Forschungszentrum Jülich
Markus Hoffmann: Peter Grünberg Institut, Forschungszentrum Jülich
Gustav Bihlmayer: Peter Grünberg Institut, Forschungszentrum Jülich
Yuriy Mokrousov: Peter Grünberg Institut, Forschungszentrum Jülich
Stefan Blügel: Peter Grünberg Institut, Forschungszentrum Jülich
Claus M. Schneider: Peter Grünberg Institut, Forschungszentrum Jülich
Christian Tusche: Peter Grünberg Institut, Forschungszentrum Jülich

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract The discovery of topological states of matter has led to a revolution in materials research. When external or intrinsic parameters break symmetries, global properties of topological materials change drastically. A paramount example is the emergence of Weyl nodes under broken inversion symmetry. While a rich variety of non-trivial quantum phases could in principle also originate from broken time-reversal symmetry, realizing systems that combine magnetism with complex topological properties is remarkably elusive. Here, we demonstrate that giant open Fermi arcs are created at the surface of ultrathin hybrid magnets where the Fermi-surface topology is substantially modified by hybridization with a heavy-metal substrate. The interplay between magnetism and topology allows us to control the shape and the location of the Fermi arcs by tuning the magnetization direction. The hybridization points in the Fermi surface can be attributed to a non-trivial mixed topology and induce hot-spots in the Berry curvature, dominating spin and charge transport as well as magneto-electric coupling effects.

Date: 2022
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DOI: 10.1038/s41467-022-32948-z

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