Development of a spin-polarized scanning tunneling potentiometry system and its application to micro fabricated surface Rashba systems

本项目的目的是对表面Rashba系统进行扫描隧道电位法（STP）测量，并探索其电荷/自旋输运现象的有趣性质。因此，我们新构建了一个扫描隧道显微镜（STM），此外，我们自己的测量系统STP测量。我们已经表明，它是可能的，同时映射的表面形貌与STM，而映射的电位分布与STP时，通过表面施加电流。利用在Si（111）衬底上形成的双金属Bi薄膜，我们证明了可以正确地测量电势梯度。另外，我们还发现了一种方法，微制造表面状态原位和测量自旋霍尔效应使用非局域传输测量使用Bi 2Se 3薄膜。

The purpose of the present project is to perform scanning tunneling potentiometry (STP) measurements on surface Rashba systems and explore the intriguing nature of its charge/spin transport phenomena. Therefore we have newly constructed a scanning tunneling microscope (STM) and furthermore, made our own measurement system for STP measurements. We have shown that it is possible to simultaneously map the surface topography with STM while mapping the potential distribution with STP when applying electrical current through the surface. Using ultrathin Bi films formed on Si(111) substrates, we have shown that the potential gradient can be measured properly. We have additionally found a way to micro fabricate surface states in situ and measure the spin Hall effect using nonlocal transport measurements using ultrathin Bi2Se3 films.