Interface engineering has become a new research field recently. Transition metal dichalcogenides, as a kind of graphenelike two-dimensional semiconductor layered material, can be constructed as rich heterostructures with various other materials, which helps to fully explore the modulation effect of interlayer interaction. Based on first-principles calculation, it is found that MoS2/FeCl2 is a typical metal-semiconductor contact heterostructure with a variety of novel physical properties, including unconventional band alignment, the coexistence of spintronics and valleytronics, and the abnormal...