No longer just a long-standing theory: scientists used light to reveal how electrons move inside a Wigner crystal
Published: August 12, 19:30
Researchers from the University of Basel in Switzerland and the Technical University of Munich in Germany have built a new technique for observing the internal electron dynamics of a Wigner crystal. This material phase, first proposed by Eugene Wigner in 1934, forms when electrons settle into an ordered lattice at very low densities. The initiative was led by Associate Professor Tomasz Smolenski. Wigner crystals are a striking example of quantum behavior on a visible scale, and their subtle internal motions have long been hard to measure.
What the experiment involved
As part of the study, the team cooled a single layer of tungsten diselenide to a temperature just above absolute zero, around -273.15 degrees Celsius. They then shone a laser on the sample, producing excitons. When these excitons met the ordered electrons, hybrid quasiparticles called polarons formed, allowing the scientists to observe how the system's optical response depended on the strength of electron-electron interactions.
The resulting signals were found to contain details about both the particles' spatial arrangement and their quantum behavior. The results were published in Nature Physics with the DOI 10.1038/s41567-026-03395-0. A high-resolution scanning tunneling microscope image of the Wigner crystal, taken by Ali Yazdani of Princeton University, served as further visual evidence.
This achievement represents an important step forward for quantum physics and materials science, deepening our understanding of how electrons interact in novel materials. Those insights may eventually lead to new technologies such as quantum computers and advanced electronic devices. Since the idea of the Wigner crystal has been around for decades, this successful experimental look at its properties opens up promising directions for future research.
As researchers continue to explore the complexities of quantum phenomena, understanding the implications of time in physics becomes increasingly crucial. Recent findings about the nature of negative time provide a fascinating context for the advancements in electron dynamics, revealing how fundamental concepts can reshape our grasp of reality and technology.