Overview
- Research teams at the University of Basel and the Technical University of Munich reported in August 2026 that reflected‑light measurements on a monolayer of tungsten diselenide show optical features tied to a Wigner crystal.
- Those features arise when light creates excitons that couple to the ordered electron lattice and form hybrid quasiparticles called Wigner crystal polarons which carry information about electron motion.
- In the experiment the Basel group cooled a single atomic layer of WSe2 to a few degrees above absolute zero, illuminated it, and analyzed the reflected light to extract the new signals.
- The optical signatures vary with the strength of electron interactions, making the technique a tool to probe strongly correlated electronic behavior and to compare different materials or conditions.
- The results, published in Nature Physics, give researchers a new, noninvasive way to study many‑body quantum dynamics and point to next steps of testing other materials and less extreme temperatures.