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Giant-Exchange-Driven Vectorial Control of a Minimal Topological Magnet in Eu3In2As4
Haonan Chen1, Xunkai Duan2,3, Guangyi Wang4
1State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai, China.
Advanced Materials (Deerfield Beach, Fla.)
|August 6, 2026
Summary
A new material, Eu3In2As4, exhibits giant exchange coupling, enabling control over topological quantum states with magnetic fields. This discovery paves the way for novel topological materials and devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Magnetism and band topology interplay is key for quantum states.
- Material realization is limited by weak exchange coupling and complex structures.
Purpose of the Study:
- Identify materials with strong exchange coupling for tunable topological phases.
- Explore the magneto-topological phase diagram of Eu3In2As4.
- Investigate exchange-driven band reconstruction and Weyl node tuning.
Main Methods:
- Theoretical prediction and characterization of Eu3In2As4.
- Measurement of magnetization-dependent band shifts (up to 300 meV).
- Quantum oscillations, anomalous Hall transport, and magneto-infrared spectroscopy.
- Theoretical modeling of Weyl node tuning via magnetization rotation.
Main Results:
- Eu3In2As4 shows giant exchange coupling and a soft magnetic response.
- A magneto-topological phase diagram reveals transitions from antiferromagnetic topological insulator to ferrimagnetic and ferromagnetic states.
- Ferromagnetic states host Weyl or nodal-ring semimetals, including a minimal Weyl model.
- Exchange-driven band reconstruction confirmed across phase transitions.
Conclusions:
- Eu3In2As4 is a model system for strong exchange coupling control of topological band structures.
- Tunable topological phases and Weyl nodes are achievable with magnetic fields.
- This work opens new avenues for designing and controlling quantum materials.
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