氯吸附的FeSe单层中出现的d波交变磁性
Emergent d-wave altermagnetism in chlorine-adsorbed FeSe monolayer
AI总结：
研究通过单边Cl吸附设计Fe2Se2Cl结构并引入空穴掺杂，在单层FeSe中实现强交变磁性。基于对称性分析和第一性原理计算揭示协同机制，诱导出高达620meV的自旋分裂，该态具有高弹性，为自旋电子学应用提供平台并激发相关研究。
AI中文摘要：
最近交变磁性的出现为凝聚态物理开辟了新领域，但能同时存在本征交变磁序和超导性的材料平台极为罕见。本文基于对称性分析和第一性原理计算，提出在典型铁基超导体单层FeSe中设计出强交变磁性的现实途径。通过单边Cl吸附设计化学计量比的Fe2Se2Cl结构并引入栅极可调空穴掺杂，实现了高度稳定的交变磁基态。计算揭示了协同机制：空穴掺杂稳定棋盘磁序，不对称配体环境打破面外空间反演对称性，诱导出高达620meV的巨大交变磁自旋分裂。关键是，该交变磁态及其巨大自旋分裂具有高弹性，在10层平板模型中仍存在。研究为自旋电子学应用提供了有前景的平台，并激发了对交变磁性与超导性相互作用的研究。
英文摘要：
The recent emergence of altermagnetism has opened new frontiers in condensed matter physics, yet material platforms capable of hosting both intrinsic altermagnetic order and superconductivity remain exceedingly rare. Here, based on symmetry analysis and first-principles calculations, we propose a realistic route to engineer robust altermagnetism in monolayer FeSe, a prototypical iron-based superconductor. By designing a stoichiometric Fe2Se2Cl structure through single-side Cl adsorption and introducing gate-tunable hole doping, we achieve a highly stable altermagnetic ground state. Our calculations reveal a synergistic mechanism: hole doping firmly stabilizes the checkerboard magnetic order, while the asymmetric ligand environment intrinsically breaks the outof-plane spatial inversion symmetry. Consequently, this interplay induces a giant altermagnetic spin splitting of up to 620 meV. Crucially, we demonstrate that this altermagnetic state and its giant spin splitting are highly resilient, persisting even in a 10-layer slab model that accurately simulates the bulk limit. By introducing altermagnetism into the well-established FeSe-based superconducting family, our findings identify Fe2Se2Cl as a promising platform for spintronic applications and motivate future studies of the possible interplay between altermagnetism and superconductivity.
