论文标题
观察在稀土三元材料的表面自旋结构中观察Cubic Rashba效应
Observation of a cubic Rashba effect in the surface spin structure of rare-earth ternary materials
论文作者
论文摘要
自旋轨道相互作用和结构反转不对称与磁性排序相结合是通往表面高度移动自旋偏振载体的新型材料的有前途的途径。从抗firomagnet TBRH2SI2的SI端端表面的光发射电流的自旋分辨测量值及其在一个从头算的一步理论中的分析揭示了沿着表面状态的四倍对称恒定恒定能量轮廓的电子旋转的异常三连环。提出了两种频段K.P模型，该模型将三重绕组作为立方Rashba效应。好奇的平面自旋摩托锁锁定非常健壮，尽管RH原子上的自旋轨道相互作用比TB 4F瞬间，但在RH原子上的自旋轨道相互作用较弱，并且在平面外交换场上仍然完好无损。
Spin-orbit interaction and structure inversion asymmetry in combination with magnetic ordering is a promising route to novel materials with highly mobile spin-polarized carriers at the surface. Spin-resolved measurements of the photoemission current from the Si-terminated surface of the antiferromagnet TbRh2Si2 and their analysis within an ab initio one-step theory unveil an unusual triple winding of the electron spin along the fourfold-symmetric constant energy contours of the surface states. A two-band k.p model is presented that yields the triple winding as a cubic Rashba effect. The curious in-plane spin-momentum locking is remarkably robust and remains intact across a paramagnetic-antiferromagnetic transition in spite of spin-orbit interaction on Rh atoms being considerably weaker than the out-of-plane exchange field due to the Tb 4f moments.
