Kim Taeyueb, Kim Shin-Ik, Baek Seung-Hyub, Hong Jinki, Koo Hyun Cheol
J Nanosci Nanotechnol. 2015 Nov;15(11):8632-6. doi: 10.1166/jnn.2015.11497.
The LaAlO3/SrTiO3 (LAO/STO) heterostructure has an inherent space inversion asymmetry causing an internal electric field near the interface. The Rashba spin-orbit coupling arising from this structural characteristic has a considerable influence on spin transport. With application of an external magnetic field, we observed conductance change in the LAO/STO interface which depends on the sign and magnitude of the field. Our systematic study revealed that these results come from spin dependent transport, by which we obtained quantitative strength of the Rashba effect. The Rashba strength in this system depends on the temperature: it varies from 2.6 x 10(-12) eVm to negligible value in the temperature range of 1.8 K-12 K. This method for detecting Rashba effect covers a wider temperature range in comparison with those obtained from Shubnikov-de Haas oscillation or weak antilocalization measurements.
LaAlO3/SrTiO3（LAO/STO）异质结构具有固有的空间反演不对称性，在界面附近产生内电场。由这种结构特性产生的Rashba自旋轨道耦合对自旋输运有相当大的影响。施加外部磁场后，我们观察到LAO/STO界面的电导变化，该变化取决于磁场的符号和大小。我们的系统研究表明，这些结果来自自旋相关输运，通过该输运我们获得了Rashba效应的定量强度。该系统中的Rashba强度取决于温度：在1.8 K至12 K的温度范围内，它从2.6×10^(-12) eVm变化到可忽略的值。与通过舒布尼科夫-德哈斯振荡或弱反局域化测量获得的方法相比，这种检测Rashba效应的方法覆盖更宽的温度范围。
