AI 中文总结
本研究利用自旋分辨与角分辨光电子能谱，解析了石墨烯/SiC界面处可可逆切换的铋前驱相与铋烯的电子态自旋织构，证实了二者的自旋-动量锁定特性。
AI 中文摘要
近期研究表明，石墨烯/SiC界面处的受限铋层可在拓扑平庸的前驱相与量子自旋霍尔绝缘体铋烯之间可逆切换。本研究对两种结构开展详细的自旋分辨与角分辨光电子能谱研究，解析其低能电子态的自旋织构。由于铋的强本征自旋轨道耦合及界面处的不对称受限势，两种结构的价带均发生Rashba分裂。通过在倒空间多个位置研究价带的自旋极化，我们证实了两种相及Kramers二重态所预期的自旋-动量锁定特性。
英文摘要
Recent studies have revealed that a confined bismuth layer at the graphene/SiC interface can be reversibly switched between a topologically trivial precursor phase and the quantum spin Hall insulator bismuthene. Here, we present a detailed spin- and angle-resolved photoelectron spectroscopy study of both structures, resolving the spin texture of their low-energy electronic states. Owing to the strong intrinsic spin-orbit coupling of bismuth and the asymmetric confinement potential at the interface, the valence bands of both structures are Rashba-split. We demonstrate the expected spin-momentum locking for both phases and Kramers' doublets through the investigation of the valence bands' spin polarization at multiple positions in reciprocal space.
