Fig. 2. Crystal and band structures of 2H-MoS₂ and experimental setup.

(A) Top and side views of a 2H-MoS₂ 2D crystal. In monolayers, spatial inversion symmetry is broken because the Mo and S sites are not equivalent, but the inversion symmetry is restored in 2H-type multilayers. (B) Schematic band structure of the conduction bottom of 2D MoS₂. The magnetic field is applied perpendicular to the plane. Owing to the combination of the spin-orbit interaction and Zeeman effect, the band asymmetry appears between the K and K′ = −K points. Their spin splittings are 2(Δ_SO + Δ_Z) and 2(Δ_SO − Δ_Z), respectively. (C) Schematic image of a MoS₂-EDLT. V_xx is a four-probe longitudinal voltage of the channel. Here, the channel direction was parallel to the zigzag edge (29).