Vanadium oxide is a material that can act as an insulator, not conducting electricity, or as a conductor, like a metal. The switch takes trillionths of a second, and that's what makes it a candidate for ultrafast electronic devices.
But exactly how it happens has long been a mystery. Scientists used an ultrafast electron microscope that snaps images every few picoseconds (a picosecond is one trillionth of a second). They hit the sample with a laser pulse to trigger the transformation and watched it spread through the material.
It turns out that the crystal lattice first loses its symmetry — atoms shift from their ideal positions. This creates strains that then propagate through the material and change its properties. For the first time, they could directly link atomic rearrangements to macroscopic behavior.
Now that the whole process is visible in detail, engineers can design devices based on such materials more precisely — from ultrafast switches to smart windows that change transparency.
Vanadium oxide is already used in smart windows that automatically darken in the sun to keep homes cool.
In the series 'Star Trek,' there's a material called 'dilithium' that changes properties under energy — vanadium oxide does something similar, but in real life.