Figure 1: The equilibrium phases of 1T–TaS₂ and demonstration of switching behaviour.

(a) An illustration of the different CDW states in 1T–TaS₂ at different temperatures. (b) Temporal behaviour of switching from HI to LO resistance in response to a pulse from a current source. The extrapolated voltage in the absence of switching is shown by the dashed lines. The time–response is determined by τ_RC=RC where R is the two-terminal circuit resistance and changes from 53 to 44 ns. Fits of the relaxation times show that the difference between τ after switching and τ_RC at the end of the pulse is<0.3 ns, setting a limit on the intrinsic speed of the device. The insert shows the measuring circuit. The small superimposed oscillations are due to ringing of the circuit. Scale bar, 2 μm.