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Magnetism-induced topological transition in EuAs3
Erjian Cheng1, Wei Xia2,3, Xianbiao Shi4,5
1State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, 200433, Shanghai, China.
Nature Communications
|December 1, 2021
Summary
Magnetic topological semimetals like EuAs3 exhibit a magnetism-induced topological transition. This study reveals a topological massive Dirac metal state in its antiferromagnetic phase, showcasing exotic physics from magnetism-topology interactions.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- The interplay between magnetism and topology in magnetic topological semimetals is not well understood.
- This interaction is predicted to yield novel physical phenomena.
Purpose of the Study:
- To investigate the magnetic semimetal EuAs3.
- To explore the magnetism-induced topological transitions and associated physical properties.
Main Methods:
- Systematic study of EuAs3.
- Electrical transport measurements.
- Angle-resolved photoemission spectroscopy (ARPES).
Main Results:
- Demonstrated a topological transition from a nodal-line semimetal to a massive Dirac metal in EuAs3.
- Verified topological states via electrical transport.
- Observed extremely large magnetoresistance (~2x10^5%) at low temperatures and high magnetic fields.
- Confirmed topological nodal-line structure using ARPES.
- Revealed a temperature-induced Lifshitz transition below 3 K.
Conclusions:
- EuAs3 serves as a compelling platform for studying magnetism-topology interactions.
- The observed phenomena highlight the potential for discovering exotic physics in magnetic topological materials.
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