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Related Experiment Video

Updated: Jun 24, 2026

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

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Published on: March 24, 2019

Crossed Surface Flat Bands in Three-Dimensional Superconducting Altermagnets.

Yuri Fukaya¹, Bo Lu², Keiji Yada³

¹Okayama University, Faculty of Environmental Life, Natural Science and Technology, 700-8530 Okayama, Japan.

Physical Review Letters

|June 22, 2026

Summary

We discovered topologically protected, crossed surface flat bands in 3D superconducting altermagnets. These bands offer a new route for detecting emergent phenomena and realizing higher-dimensional topological phases.

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Last Updated: Jun 24, 2026

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Phenomena

Background:

Superconducting altermagnets are promising for emergent phenomena.
Previous studies focused on two-dimensional systems.

Purpose of the Study:

Investigate three-dimensional d- and g-wave altermagnets.
Explore the formation of crossed surface flat bands.

Main Methods:

Theoretical investigation of 3D altermagnets.
Analysis of superconducting and altermagnetic symmetries.
Topological protection analysis.

Main Results:

Formation of topologically protected, crossed surface flat bands at zero energy.
Number of band corners determined by crystal symmetry.
Superconducting nodal lines induce Bogoliubov-Fermi surfaces and zero-energy arcs.
Coexistence of three distinct charge conductance dependences.

Conclusions:

The findings offer a solid method for detecting these phenomena.
Paves the way for realizing higher-dimensional topological phases using altermagnets.