supported by the National Natural Science Foundation of China (11774191, 51727805, and 51672152);the Open Research Fund Program of the State Key Laboratory of LowDimensional Quantum Physics (KF201603);the Thousand Youth Talents Program of China
Two-dimensional (2D) materials have attracted growing attention since the discovery of graphene [1]. Transition metal dichalcogenide (TMD) semiconductors, such as MoS2 and WS2, became popular materials in recent y...