Orbital-dependent quasiparticle scattering interference in 3R-NbS2

Article

关键词: VALLEY;    MOS2;    SPIN;    POLARIZATION;    SURFACE;    STATES;   

DOI  :  10.1103/PhysRevB.96.075206

来源: SCIE

【 摘 要 】

A valley degree of freedom (DOF) in transition-metal dichalcogenides with broken inversion symmetry can be controlled through spin and orbital DOFs owing to their valley-contrasting characters. Another important aspect of the spin and orbital DOFs is that they affect quasiparticle scattering processes that govern the valley lifetime. Here we combine quasiparticle-interference (QPI) imaging experiments and theoretical simulations to study the roles of the spin and orbital DOFs in 3R-NbS2. We find that the QPI signal arising from an intervalley scattering is noticeably weaker than that caused by an intravalley scattering. We show that this behavior is predominantly associated with the orbital DOF, signifying the different spin and orbital structures of spin-split bands at each valley. These findings provide important insights into understanding the valley-related transport properties.

【 授权许可】

Free