Hierarchical spin-orbital polarization of a giant Rashba system.
Hierarchical spin-orbital polarization of a giant Rashba system.
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巨型Rashba系统的分层自旋轨道极化。
DOI：
10.1126/sciadv.1500495
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发表时间：
2015-09
期刊：
影响因子：
13.6
通讯作者：
King PD
中科院分区：
文献类型：
--
作者：
Bawden L;Riley JM;Kim CH;Sankar R;Monkman EJ;Shai DE;Wei HI;Lochocki EB;Wells JW;Meevasana W;Kim TK;Hoesch M;Ohtsubo Y;Le Fèvre P;Fennie CJ;Shen KM;Chou F;King PD
角分辨光电子能谱揭示了Rashba化合物BiTeI中伴随着自旋分裂的复杂轨道织构的出现。拉什巴效应是固体中最显著的自旋-轨道耦合现象之一，它为蓬勃发展的半导体自旋电子学领域提供了基石。它通常被认为表现为单个初始自旋简并带分裂成具有相反自旋极化的两个分支的动量相关分裂。结合偏振相关和共振角分辨光电子能谱测量和密度泛函理论计算，我们发现模型巨星Rashba系统BiTeI的两个“自旋分裂”分支另外发展了不同的轨道织构，每个织构都耦合到不同的自旋组态。这就需要重新解释类Rashba系统中的自旋分裂，并为通过轨道扇区控制自旋极化开辟了新的可能性。
Angle-resolved photoemission reveals the emergence of complex orbital texture concomitant with spin splitting in the Rashba compound BiTeI. The Rashba effect is one of the most striking manifestations of spin-orbit coupling in solids and provides a cornerstone for the burgeoning field of semiconductor spintronics. It is typically assumed to manifest as a momentum-dependent splitting of a single initially spin-degenerate band into two branches with opposite spin polarization. Combining polarization-dependent and resonant angle-resolved photoemission measurements with density functional theory calculations, we show that the two “spin-split” branches of the model giant Rashba system BiTeI additionally develop disparate orbital textures, each of which is coupled to a distinct spin configuration. This necessitates a reinterpretation of spin splitting in Rashba-like systems and opens new possibilities for controlling spin polarization through the orbital sector.