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Ferromagnetic Weyl Fermions in Two-Dimensional Layered Electride Gd_{2}C
Shuyuan Liu1,2, Chongze Wang1, Liangliang Liu3
1Department of Physics, Research Institute for Natural Science, and Institute for High Pressure at Hanyang University, Hanyang University, 222 Wangsimni-ro, Seongdong-Ku, Seoul 04763, Republic of Korea.
Physical Review Letters
|November 16, 2020
Summary
Researchers discovered a novel Weyl semimetal phase in a two-dimensional layered electride, Gd2C. This room-temperature ferromagnetic material exhibits Weyl fermions, offering new avenues for exploring magnetic Weyl physics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Two-dimensional layered electrides are a novel class of materials featuring anionic electrons.
- These materials offer unique electronic properties due to their layered structure and interstitial electron states.
Purpose of the Study:
- To discover new topological quantum states in two-dimensional layered electrides.
- To investigate the potential of ferromagnetic electrides for hosting exotic electronic phases.
Main Methods:
- First-principles calculations were employed to investigate the electronic structure of Gd2C.
- Analysis focused on band inversion, spin-orbit coupling effects, and Berry curvature.
Main Results:
- A time-reversal-symmetry-breaking Weyl semimetal phase was discovered in the ferromagnetic electride Gd2C.
- The material exhibits spinful Weyl nodal lines and multiple pairs of Weyl nodes.
- Large intrinsic anomalous Hall conductivity was predicted due to Berry curvature.
Conclusions:
- Gd2C is identified as a room-temperature ferromagnetic electride hosting Weyl fermions.
- This discovery provides a new platform for studying the interplay of electride properties and magnetic Weyl physics.
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