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Robust flat-magnetoresistivity in D03-Fe3Ga driven by chiral anomaly.
Ruoqi Wang1, Xinyang Li1, Bo Zhao2,3
1Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing, China.
Nature Communications
|May 26, 2026
Summary
We discovered robust chiral-anomaly transport in D03-Fe3Ga, a topological flat-band semimetal. This material shows unique magnetoresistance and non-Fermi-liquid behavior, ideal for quantum devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Physics
Background:
- Topologically non-trivial nodes from flat-band crossings are crucial for topological responses and correlation-driven topological physics.
- Exploring novel materials with unique electronic properties is essential for advancing quantum physics.
Purpose of the Study:
- To investigate the robust chiral-anomaly-dominated transport in D03-Fe3Ga.
- To confirm the existence of tilted Weyl points and their relation to flat-bands.
- To characterize the material's potential as a topological flat-band semimetal.
Main Methods:
- Experimental observation of magnetoresistance (positive/negative, PLMR, PHE), planar Hall effect, and ultra-low-temperature resistivity.
- Density Functional Theory (DFT) calculations to confirm Weyl points and flat-band crossings.
- Analysis of anomalous Hall conductivity (AHC) and flat-magnetoresistance (flat-MR).
Main Results:
- D03-Fe3Ga exhibits a combination of positive/negative magnetoresistance, ideal PLMR, and PHE.
- Pronounced non-Fermi-liquid (NFL) behavior and giant intrinsic AHC were observed at ultra-low temperatures.
- DFT calculations confirmed tilted Weyl points arising from nearly 3D flat-band crossings.
- An exceptionally robust flat-MR was detected up to 33 T, persisting without decay.
- Evidence suggests the Fermi level intersects flattened Weyl crossings, a hallmark of ideal topological semimetals.
Conclusions:
- D03-Fe3Ga presents pristine characteristics of a topological flat-band semimetal.
- The observed phenomena strongly support the presence of topological flat-band crossings.
- This material serves as a promising platform for quantum device innovations.
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