Orbital-dependent quasiparticle scattering interference in 3R-NbS2

Abstract

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 inter-valley scattering is noticeably weaker than that caused by an intra-valley 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.

12 pages, 6 figures, accepted for publication in PRB

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Cited by in corpus (4)

• Symmetry-forbidden intervalley scattering by atomic defects in monolayer transition-metal dichalcogenides
• Fermiology and electron-phonon coupling in the 2H and 3R polytypes of NbS${}_2$
• Impurity-pinned incommensurate charge density wave and local phonon excitations in 2H-NbS2
• Uncovering hidden Fermi surface instabilities through visualizing unconventional quasiparticle interference in CeTe3