Spin Orientation of Two-Dimensional Electrons Driven by Temperature-Tunable Competition of Spin-Orbit and Exchange-Magnetic Interactions.
Spin Orientation of Two-Dimensional Electrons Driven by Temperature-Tunable Competition of Spin-Orbit and Exchange-Magnetic Interactions.
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DOI：
10.1021/acs.nanolett.6b04036
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发表时间：
2017-01
期刊：
影响因子：
10.8
通讯作者：
A. Generalov;M. Otrokov;A. Chikina;K. Kliemt;K. Kummer;M. Höppner;M. Güttler;S. Seiro;A. Fedorov;S. Schulz;S. Danzenbächer;E. Chulkov;C. Geibel;C. Laubschat;P. Dudin;M. Hoesch;Timur K. Kim;M. Radović;M. Shi;N. Plumb;C. Krellner;D. Vyalikh
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文献类型：
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作者：
A. Generalov;M. Otrokov;A. Chikina;K. Kliemt;K. Kummer;M. Höppner;M. Güttler;S. Seiro;A. Fedorov;S. Schulz;S. Danzenbächer;E. Chulkov;C. Geibel;C. Laubschat;P. Dudin;M. Hoesch;Timur K. Kim;M. Radović;M. Shi;N. Plumb;C. Krellner;D. Vyalikh
寻找创造和控制二维电子态(2DESS)与自旋相关的性质的方法是开发基于自旋的新型器件的主要挑战。自旋-轨道和交换-磁相互作用(SOI和EMI)是两种基本的机制，使得能够获得与自旋相关的载流子性质的可调性。HoRh2Si2的硅表面似乎是一个独特的模型系统，其中可以通过改变温度来可视化和控制并发的SOI和EMI。这个系统的美丽和简单在于4f矩，它充当了2DES上的多重调谐工具，因为4f投影在本质上不同的温度下平行和垂直于表面顺序。在这里，我们证明了当4f力矩无序时，SOI将2DES的自旋锁定在表面处：Rashba-Bychkov效应。当温度逐渐降低，系统经历磁序时，上升的EMI逐渐与SOI竞争，导致2DES的自旋相关性质发生根本变化。自旋旋转并重新定向到平面外的Ho 4f力矩。我们的发现表明，只需使用一个参数：温度，就可以控制表面二维电子的自旋方向和自旋分裂。
Finding ways to create and control the spin-dependent properties of two-dimensional electron states (2DESs) is a major challenge for the elaboration of novel spin-based devices. Spin-orbit and exchange-magnetic interactions (SOI and EMI) are two fundamental mechanisms that enable access to the tunability of spin-dependent properties of carriers. The silicon surface of HoRh2Si2 appears to be a unique model system, where concurrent SOI and EMI can be visualized and controlled by varying the temperature. The beauty and simplicity of this system lie in the 4f moments, which act as a multiple tuning instrument on the 2DESs, as the 4f projections parallel and perpendicular to the surface order at essentially different temperatures. Here we show that the SOI locks the spins of the 2DESs exclusively in the surface plane when the 4f moments are disordered: the Rashba-Bychkov effect. When the temperature is gradually lowered and the system experiences magnetic order, the rising EMI progressively competes with the SOI leading to a fundamental change in the spin-dependent properties of the 2DESs. The spins rotate and reorient toward the out-of-plane Ho 4f moments. Our findings show that the direction of the spins and the spin-splitting of the two-dimensional electrons at the surface can be manipulated in a controlled way by using only one parameter: the temperature.