Universal phase dynamics in VO2 switches revealed by ultrafast operando diffraction

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Science  16 Jul 2021:
Vol. 373, Issue 6552, pp. 352-355
DOI: 10.1126/science.abc0652

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A transient metal

Vanadium dioxide is known to have a coupled structural and electronic transition that can be accessed through light, thermal, or electrical excitation. Ultrafast optical studies of this insulator-to-metal transition indicate that it is mediated by the formation of a transient metallic phase that retains the structure of the original insulating phase. Sood et al. show that a similar sequence occurs when the material is electrically excited with a series of voltage pulses. Using ultrafast electron diffraction, the researchers monitored the structure of a vanadium dioxide sample after excitation and found evidence of a metastable metallic phase that appears during the transition.

Science, abc0652, this issue p. 352

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