Observation of Out-of-Plane Spin Texture in a SrTiO3 (111) Two-Dimensional Electron Gas
Observation of Out-of-Plane Spin Texture in a SrTiO3 (111) Two-Dimensional Electron Gas
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DOI：
10.1103/physrevlett.120.266802
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发表时间：
2018-06-29
影响因子：
8.6
通讯作者：
Yang, Hyunsoo
中科院分区：
文献类型：
--
作者：
He, Pan;Walker, S. McKeown;Yang, Hyunsoo
研究了SrTiO_3（111）表面d电子基二维电子气（2DEG）的二阶双线性磁电阻（BMER）效应.我们发现的自旋分裂带结构的证据与原型的自旋动量锁定的Rashba效应的面内组件。在平面外磁场下，我们发现BMER信号打破了电子色散的六重对称性，这是动量依赖的平面外自旋分量存在的指纹。相对论电子结构的计算再现这种自旋纹理，并表明，平面外的组件是一个无处不在的属性的氧化物2DEG所产生的强晶场效应。我们进一步表明，SrTiO 3（111）2DEG的BMER响应是可调的，出乎意料的大。
We explore the second order bilinear magnetoelectric resistance (BMER) effect in the d-electron-based two-dimensional electron gas (2DEG) at the SrTiO3(111) surface. We find evidence of a spin-split band structure with the archetypal spin-momentum lockig of the Rashba effect for the in-plane component. Under an out-of-plane magnetic field, we find a BMER signal that breaks the sixfold symmetry of the electronic dispersion, which is a fingerprint for the presence of a momentum-dependent out-of-plane spin component. Relativistic electronic structure calculations reproduce this spin texture and indicate that the out-of-plane component is a ubiquitous property of oxide 2DEGs arising from strong crystal field effects. We further show that the BMER response of the SrTiO3(111) 2DEG is tunable and unexpectedly large.