论文标题
反铁磁性狄拉克半米中NéelVector的超快重新定位
Ultrafast reorientation of the Néel vector in antiferromagnetic Dirac semimetals
论文作者
论文摘要
抗铁磁铁具有独特的特征，例如针对扰动场的超快动态和鲁棒性，从而引起了人们对基本物理和技术应用的极大兴趣。最近，据透露，可以通过平均时间对称性的抗铁磁铁中的电流引起的交错（néel）自旋轨道扭矩来切换NéelVector，此外，非甲状化的对称性可以使Dirac Fermions的控制。但是，磁性和电子结构的实时动力学在很大程度上尚未开发。在这里，我们提出了反铁磁性狄拉克半学中超快动力学的理论，并表明NéelVector被Terahertz-Pulse诱导的NéelSpin-Orbit扭矩和其他源自磁性型Anisotropies的NéelSpin-Orbit扭矩和其他扭矩旋转在Picsecond Timecale中。这种重新定位伴随着对Dirac Fermions质量的调节，可以通过磁光效应实时观察到。我们的结果为新兴的超快抗磁性旋转旋转和材料的拓扑方面相结合提供了理论基础。
Antiferromagnets exhibit distinctive characteristics such as ultrafast dynamics and robustness against perturbative fields, thereby attracting considerable interest in fundamental physics and technological applications. Recently, it was revealed that the Néel vector can be switched by a current-induced staggered (Néel) spin-orbit torque in antiferromagnets with the parity-time symmetry, and furthermore, a nonsymmorphic symmetry enables the control of Dirac fermions. However, the real-time dynamics of the magnetic and electronic structures remain largely unexplored. Here, we propose a theory of the ultrafast dynamics in antiferromagnetic Dirac semimetals and show that the Néel vector is rotated in the picosecond timescale by the terahertz-pulse-induced Néel spin-orbit torque and other torques originating from magnetic anisotropies. This reorientation accompanies the modulation of the mass of Dirac fermions and can be observed in real time by the magneto-optical effects. Our results provide a theoretical basis for emerging ultrafast antiferromagnetic spintronics combined with the topological aspects of materials.
