Anomalous Insulator-Metal Transition in Boron Nitride-Graphene Hybrid Atomic Layers
RICE UNIV HOUSTON TX DEPT OF MECHANICAL ENGINEERING AND MATERIALS SCIENCE
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The study of two-dimensional 2D electronic systems is of great fundamental significance in physics. Atomic layers containing hybridized domains of graphene and hexagonal boron nitride h-BNC constitute a new kind of disordered 2D electronic system. Magnetoelectric transportmeasurements performed at low temperature in vapor phase synthesized h-BNC atomic layers show a clear and anomalous transition from an insulating to a metallic behavior upon cooling. The observed insulator to metal transition can be modulated by electron and hole doping and by the application of an external magnetic field. These results supported by ab initio calculations suggest that this transition in h-BNC has distinctly different characteristics when compared to other 2D electron systems and is the result of the coexistence between two distinct mechanisms, namely, percolation through metallic graphene networks and hopping conduction between edge states on randomly distributed insulating h-BN domains.
- Industrial Chemistry and Chemical Processing
- Inorganic Chemistry
- Physical Chemistry