Independent spin polarized valence electronic states in VSe2 from charge density wave transition

Abstract

Vanadium diselenide (VSe2) is a van der Waals layered transitional metal dichalcogenide, which has attracted intensive attention due to the coexistence of charge density wave (CDW) transition and magnetic property down to two-dimension limit. We apply Spin- and angle-resolved photoemission spectroscopy measurement to explore the evolution of the valence eletronic states of VSe2 accompanied with the CDW transition. The V 3d-derived-band in the vicinity of Fermi energy shows negligible spin polarization both below and above the CDW transition temperature. Furthermore, a sizable spin polarization of Se 4p electronic states has been clearly observed, indicating an atomic-layer-dependent spin polarization in VSe2. Our results provide new clues to understand the spin polarized electronic states in transitional metal dichalcogenides.