电场
凝聚态物理
对称(几何)
自旋(空气动力学)
零场分裂
反铁磁性
退化(生物学)
物理
磁化
领域(数学)
磁场
自旋极化
量子力学
数学
生物
热力学
生物信息学
电子
纯数学
几何学
作者
Dinghui Wang,Huaiqiang Wang,Lulu Liu,Junting Zhang,Haijun Zhang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-12-16
标识
DOI:10.1021/acs.nanolett.4c05384
摘要
Altermagnetism, as a recently discovered unconventional antiferromagnetism, allows the lifting of spin degeneracy without net magnetization. The spin splitting of the intrinsic altermagnets is protected by the spin space group symmetry and is therefore difficult to control externally. Here, we propose an extrinsic altermagnet as a complement to the intrinsic altermagnet, whose spin splitting is induced by and can be significantly modulated by the electric field. We then screened intrinsic and extrinsic altermagnets by combining symmetry analysis and high-throughput calculations, identifying 16 intrinsic altermagnets and 24 extrinsic altermagnets. We demonstrate that the spin splitting of extrinsic altermagnets is proportional to the electric field strength, and its sign can be switched by reversing the electric field. Some extrinsic altermagnets exhibit considerable spin splitting, such as CaMnSi with 398 meV under an electric field of 0.1 V/Å. This work provides a realistic material platform for the potential application of 2D altermagnets.
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