Lundi 5 septembre à 10h30, salle 22-32 201
Kazuyuki Sakamoto – Department of Applied Physics, Osaka University, Japan
Elucidating the origin of spin-polarized electronic states of 2D atomic layer crystals (ALCs) formed on solid surfaces 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 spin-orbit coupling and potential gradient induced by broken inversion symmetry, was believed to be the main origin of the spin-polarized states, but the spin textures of most ALCs are different from that expected by the ideal RB effect. In this talk, I first illustrate how the symmetry of the ALC’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 ALCs and to point out opportunities for exploring exotic physical properties when combining spin and other physics, and to realize future spintronics-based quantum devices.