Anomalous conductivity near percolative metal-insulator transition in monolayer MoS₂

Conductivity of the insulating phase increases generally upon increasing a drain-source voltage due to the field-enhanced hopping or heating effect. Here, we report the opposite behavior, and anomalous metallic to insulating phase transition driven by a voltage at low voltage regime in monolayer molybdenum disulfide. We ascribe these features to the inhomogeneous state of the system in which the transport is governed by a percolation. At the higher voltage regime, the insulating phase is transformed further to the metallic phase, exhibiting unique multi-phases in this system. In this talk, we discuss these anomalous behaviors and their implications in a metal-insulator transition in two-dimension.