Spin-polarized electrons in atomic layer materials formed on solid surfaces
Elucidating the origin of spin-polarized electronic states of 2D atomic layer materials (ALMs) is one of the hottest topics in both fundamental science and applications. So far, the Rashba-Bychkov (RB) effect, which arises from the combination of potential gradient induced by broken inversion symmetry and spin-orbit coupling (SOC), was believed to be the main origin, but the spin textures of most ALMs are different from that expected by the ideal RB effect. In this talk, I first illustrate how the symmetry of the ALM's atomic structure can affect the spin texture, and then introduce that various spin textures, ranging from the RB-type to those that cannot be explained based on the origins proposed so far, can be simply induced by the orbital angular momentum. This talk aims to provide an overview on the insights gained on the spin-polarized electronic states of ALMs and to point out opportunities for exploring exotic physical properties when combining spin and other physics, and to realize future spintronics-based quantum devices.