Metal-insulator transition-induced electrical oscillation in vanadium dioxide thin film.

In this letter, we report an observation of room temperature electrical oscillation in vanadium dioxide (VO₂), a representative strongly correlated material showing a metal-insulator transition. An electric circuit for the oscillation is simply composed of a voltage source and two-terminal VO₂ thin film device serially connected with a standard resistor. The systematic procedures where the oscillation occurred were explained based on the electrical relationship between the VO₂ device and resistor, and the generation window of the oscillation was determined. In particular, the oscillation frequency could be controlled by adjusting an external voltage and increased up to >0.5 MHz. [ABSTRACT FROM AUTHOR]