Theory of the Spin Galvanic Effect at Oxide Interfaces.
Theory of the Spin Galvanic Effect at Oxide Interfaces.
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DOI：
10.1103/physrevlett.119.256801
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发表时间：
2017-06
影响因子：
8.6
通讯作者：
G. Seibold;S. Caprara;M. Grilli;R. Raimondi
中科院分区：
文献类型：
--
作者：
G. Seibold;S. Caprara;M. Grilli;R. Raimondi
自旋伽伐尼效应（SGE）描述了非平衡自旋极化到横向电荷电流的转换。最近的实验表明，在两种绝缘氧化物LaAlO_{3}和SrTiO_{3}的界面上形成的二维电子气具有很高的转换效率。在这里，我们分析的SGE氧化物界面内的三带模型的Ti的t_{2g}轨道，显示了一个有趣的各种有效的自旋轨道耦合在各个频带，有助于不同的自旋-电荷转换。我们的分析方法是由一个数值处理的补充，我们也调查的无序和温度的影响，这是至关重要的实验数据提供一个适当的描述。
The spin galvanic effect (SGE) describes the conversion of a nonequilibrium spin polarization into a transverse charge current. Recent experiments have demonstrated a large conversion efficiency for the two-dimensional electron gas formed at the interface between two insulating oxides, LaAlO_{3} and SrTiO_{3}. Here, we analyze the SGE for oxide interfaces within a three-band model for the Ti t_{2g} orbitals which displays an interesting variety of effective spin-orbit couplings in the individual bands that contribute differently to the spin-charge conversion. Our analytical approach is supplemented by a numerical treatment where we also investigate the influence of disorder and temperature, which turns out to be crucial to providing an appropriate description of the experimental data.