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Spanning Fermi arcs in a two-dimensional magnet.

Ying-Jiun Chen1,2, Jan-Philipp Hanke3,4, Markus Hoffmann3,4

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|September 9, 2022
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Summary
This summary is machine-generated.

Researchers created giant open Fermi arcs on hybrid magnets by combining magnetism and topology. This breakthrough allows control over Fermi arcs by tuning magnetization, impacting spin and charge transport.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Topological states of matter have revolutionized materials research.
  • Breaking symmetries, like inversion or time-reversal symmetry, drastically alters material properties.
  • Combining magnetism with complex topological properties remains a significant challenge.

Purpose of the Study:

  • To realize systems exhibiting non-trivial quantum phases from broken time-reversal symmetry.
  • To investigate the emergence of giant open Fermi arcs in hybrid magnetic materials.
  • To explore the control of topological properties via hybridization and magnetization.

Main Methods:

  • Fabrication of ultrathin hybrid magnets.
  • Utilizing hybridization with a heavy-metal substrate to modify Fermi-surface topology.
  • Investigating the interplay between magnetism and topology through magnetization tuning.

Main Results:

  • Demonstrated the creation of giant open Fermi arcs at the surface of hybrid magnets.
  • Showcased the ability to control Fermi arc shape and location by tuning magnetization direction.
  • Identified hybridization points inducing hot-spots in Berry curvature, influencing transport properties.

Conclusions:

  • The study successfully combines magnetism and topology in hybrid materials.
  • Tunable Fermi arcs offer new avenues for controlling spin and charge transport.
  • The findings open possibilities for novel magneto-electric coupling effects in topological materials.