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Related Experiment Video

Updated: Nov 21, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Topologically distinct Weyl fermion pairs.

Ming-Chien Hsu¹, Hsin Lin², M Zahid Hasan³

¹Department of Physics, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan.

Scientific Reports

|January 12, 2021

Summary

Weyl semimetals exhibit unique topological properties. Their zeroth Landau levels (LLs) are protected by node vorticity, not chirality, influencing magnetic tunneling behavior.

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Area of Science:

Condensed Matter Physics
Topological Materials
Quantum Phenomena

Background:

Weyl semimetals feature Weyl nodes in pairs with opposite chiralities.
Interconnections between Weyl nodes dictate distinct topological properties.

Purpose of the Study:

To differentiate topological aspects of Weyl semimetals based on node vorticity.
To investigate the behavior of zeroth Landau levels (LLs) under magnetic fields.

Main Methods:

Analysis of two proposed Weyl semimetal models with differing vorticities.
Examination of magnetic tunneling phenomena and Landau level behavior.

Main Results:

The number of zero-energy modes is protected by Weyl node vorticity, not chirality.
Magnetic tunneling does not universally expel zeroth Landau levels from zero energy.
Vorticity influences disorder effects, surface Fermi arcs, and Weyl node annihilation.

Conclusions:

Weyl node vorticity is a key factor in determining topological properties and Landau level behavior.
Further research is needed to explore implications for weak (anti-)localization, Fermi arcs, and node annihilation.