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The discovery of three-dimensional Van Hove singularity
Wenbin Wu1,2,3, Zeping Shi1, Mykhaylo Ozerov4
1State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China.
Nature Communications
|March 15, 2024
Summary
Researchers discovered three-dimensional Van Hove singularities (VHS) in the topological magnet EuCd2As2 using magneto-infrared spectroscopy. This finding opens new avenues for exploring novel electronic states in 3D materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Topological Materials
Background:
- Van Hove singularities (VHS) arise from extreme points in electronic band structures, causing a divergent density of states (DOS).
- VHS are known to induce novel phenomena like unconventional superconductivity but are rarely observed in three dimensions (3D).
Purpose of the Study:
- To report the discovery of 3D VHS in a topological magnet.
- To investigate the tunability of electronic band structures using external magnetic fields.
Main Methods:
- Magneto-infrared spectroscopy was employed to probe the electronic properties of EuCd2As2.
- External magnetic fields were applied to control exchange interactions and modify band structures.
Main Results:
- The study successfully identified 3D VHS in the topological magnet EuCd2As2.
- The formation of 3D VHS was evidenced by the emergence of inter-band transitions above a critical magnetic field.
- Experimental findings were quantitatively explained using a minimal model of Weyl semimetals.
Conclusions:
- The discovery of 3D VHS in EuCd2As2 provides a new platform for studying exotic electronic states.
- This work highlights the potential for exploring the interplay between electronic correlations and topological phases in 3D materials.
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