Large Rashba unidirectional magnetoresistance in the Fe/Ge(111) interface states

The structure inversion asymmetry at surfaces and interfaces give rise to the Rashba spin-orbit interaction (SOI), that breaks spin degeneracy of surface or interface states. Hence, when an electric current runs through a interface, this effect generates effective magnetic field acting on electron spin. This provides additional tool manipulate state in materials such as Si Ge that, their bulk form, possess symmetry (or lack structural inersion asymmetry). existence states could be demonstrated by photoemission spectroscopy between different metals Ge(111) spin-charge conversion experiments Fe/Ge(111) even though made two light elements. In work, we identify fingerprint magnetotransport measurements form large unidirectional magnetoresistance up 0.1 \%. From its temperature dependence, find energy splitting is larger than pure subsurface