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TITLE Dichotomy of saddle points in energy bands of monolayer NbSe2
KIAS AUTHORS Son, Young-Woo
JOURNAL PHYSICAL REVIEW B, 2021
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ABSTRACT We theoretically show that two distinctive spin textures manifest themselves around saddle points in energy bands of monolayer NbSe2 under external gate potentials. While the density of states at all saddle points diverge logarithmically, ones at the zone boundaries display a windmill-shaped spin texture while the others unidirectional spin orientations. The disparate spin-resolved states are demonstrated to contribute an intrinsic spin Hall conductivity significantly while their characteristics differ from each other. Based on a minimal but essential tight-binding approximation reproducing first-principles computation results, we established distinct effective Rashba Hamiltonians for each saddle point, realizing the unique spin textures depending on their momentum. Energetic positions of the saddle points in a single layer NbSe2 are shown to be well controlled by a gate potential so that it could be a prototypical system to test a competition between various collective phenomena triggered by diverging density of states and their spin textures in low dimension.
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