  Twisting is a novel technique for creating strongly correlated effects in
two-dimensional bilayered materials, and can tunably generate nontrivial
topological properties, magnetism, and superconductivity. Magnetism is
particularly significant as it can both compete with superconductivity and lead
to the emergence of nontrivial topological states. However, the origin of
magnetism in twisted structures remains a subject of controversy. Using
self-developed large-scale electronic structure calculations, we propose the
magnetism in these twisted bilayer systems originates from spin splitting
induced by the enhanced ratio of the exchange interaction to band dispersion.
