Van der Waals heterostructures of transition metal dichalcogenides with interlayer coupling offer an exotic platform to realize fascinating phenomena. Due to the type II band alignment of these heterostructures, electrons and holes are separated into different layers. The localized electrons induced doping in one layer, in principle, would lift the Fermi level to cross the spin-polarized upper conduction band and lead to strong manipulation of valley magnetic response. Here, we report the significantly enhanced valley Zeeman splitting and magnetic tuning of polarization for the direct optical transition of MoS₂ in MoS₂/WS₂ heterostructures. Such strong enhancement of valley magnetic response in MoS₂ stems from the change of the spin-valley degeneracy from 2 to 4 and strong many-body Coulomb interactions induced by ultrafast charge transfer. Moreover, the magnetic splitting can be tuned monotonically by laser power, providing an effective all-optical route towards engineering and manipulating of valleytronic devices and quantum-computation.

带有层间偶合的过渡金属二硫化碳的范德华斯异质结构提供了一个奇异的平台，以实现令人着迷的现象。由于这些异质结构的II型能带排列，电子和空穴被分为不同的层。原则上，局部电子在一层中引起的掺杂会提升费米能级，使其穿过自旋极化的上导带，并导致对谷磁响应的强烈控制。在此，我们报道了显著增强谷塞曼分裂和极化磁调谐的MoS的直接光跃迁₂中的MoS ₂ / WS _2个异质结构。MoS ₂中谷磁响应的如此强烈增强源于自旋谷的简并性从2变为4，以及超快电荷转移引起的强多体库仑相互作用。而且，磁分裂可以通过激光功率单调地进行调谐，从而提供了一条有效的全光路径，可用于设计和操纵波谷电子器件以及进行量子计算。