Unlocking hidden spins in centrosymmetric <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>1</mml:mn><mml:mi>T</mml:mi></mml:mrow></mml:math> transition metal dichalcogenides by vacancy-controlled spin-orbit scattering

Spin current generation and manipulation remain the key challenge of spintronics, in which relativistic spinorbit coupling (SOC) play a ubiquitous role. In this letter, we demonstrate that hidden Rashba spins non-magnetic, centrosymmetric lattice multilayer SnSe2 can be efficiently activated by spin-orbit scattering introduced Se vacancies. Via vacancy scattering, conduction electrons with spin-momentum locked polarizations acquire out-of-plane magnetization components, effectively break chiral symmetry between two sublattices an monolayer when electron start precession strong built-in SOC field. The resulting spin separations are manifested quantum transport as concentrationand temperature-dependent crossovers from weak antilocalization (WAL) to localization (WL), distinctive relaxation mechanism Dyakonov-Perel type. Our study shows great potential twodimensional systems hidden-spin textures for spintronics.