In Only a Handful of Femtoseconds: Japanese Team Captures a Concealed Phase of Matter on Camera
For the first time, a hidden intermediate state of matter has been recorded while light altered a material's properties. Researchers from the Tokyo Institute of Science, Tohoku University, and Nagoya Institute of Technology made the observation. Their findings appeared in Physical Review Letters on August 10 and show that the new phase takes shape in 30 femtoseconds, unfolding in two distinct steps. To track this process, the team fired laser pulses just 6 femtoseconds long.
Study leader Tadahiko Ishikawa commented: "What we discovered is that the hidden state emerges through an intermediate phase that had not been recognized before."
The experiments targeted a complex metal-organic framework exposed to light pulses. According to the results, the transformation proceeds in two stages: first, the pulse alters the strength of interactions between electrons; only after this "electronic jolt" do the atoms themselves begin to move.
- First, the optical pulse modifies the bonding forces among electrons.
- Only following that electronic disturbance do the atoms start shifting.
These findings underscore the importance of research in materials science and photonics, opening new avenues for investigating ultrafast property changes in matter. A femtosecond is one quadrillionth of a second, making the observed transition almost unimaginably fast.
The Japanese team's work could find broad use, especially in developing materials that change characteristics rapidly when exposed to light. Such advances may benefit electronics, optics, and energy technologies. A deeper grasp of hidden phases could also support new approaches to storing information and processing data at the molecular level.