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arXiv 1507.08588cond-mat.mtrl-scicond-mat.mes-hall
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巨Rashba系统的分级自旋轨道极化

Hierarchical spin-orbital polarisation of a giant Rashba system

L. Bawden, J. M. Riley, C. H. Kim, R. Sankar, E. J. Monkman, D. E. Shai, H. I. Wei, E. Lochocki, J. W. Wells, W. Meevasana, T. K. Kim, M. Hoesch, Y. Ohtsubo, P.… 展开作者

L. Bawden, J. M. Riley, C. H. Kim, R. Sankar, E. J. Monkman, D. E. Shai, H. I. Wei, E. Lochocki, J. W. Wells, W. Meevasana, T. K. Kim, M. Hoesch, Y. Ohtsubo, P. Le Fèvre, C. J. Fennie, K. M. Shen, F. C. Chou, P. D. C. King

摘要:

Rashba效应是固体中自旋-轨道耦合最显著的表现之一,并为新兴的半导体自旋电子学领域提供了基石。它通常被认为是表现为一个动量依赖分裂的一个单一的初始自旋简并带成两个分支与相反的自旋极化。在这里,结合偏振相关和共振角分辨光电发射测量与密度泛函理论计算,我们表明,两个“自旋分裂”分支的模型巨人Rashba系统BiTeI另外开发不同的轨道纹理,其中每一个都耦合到一个不同的自旋配置。这需要重新解释Rashba类系统中的自旋分裂,并为通过轨道扇区控制自旋极化开辟了新的可能性。

英文摘要:

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 polarisation. Here, combining polarisation-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 re-interpretation of spin splitting in Rashba-like systems, and opens new possibilities for controlling spin polarisation through the orbital sector.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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