Spin-orbit coupling (SOC) in chiral materials can induce chirality-dependent
spin splitting, enabling electrical manipulation of spin polarization. Here, we
use first-principles calculations to investigate the electronic states of
chiral one-dimensional (1D) InSeI, which has two enantiomorphic configurations
with left- and right-handedness. We find that opposite spin states exist in the
left- and right-handed 1D InSeI with significant spin splitting. Although the
spin states at the conduction band minimum (CBM) and valence band maximum (VBM)
are both degenerate, a direct-to-indirect bandgap transition occurs when a
moderate tensile strain (∼4%) is applied along the 1D chain direction,
leading to chirality-dependent and collinear spin-momentum locking at the CBM.
These findings indicate that 1D InSeI is a promising material for chiral
spintronics.Comment: 7 pages, 3 figure