Russian researchers spot Wigner crystals using light

Researchers from the Russian Quantum Center, ITMO University, and MIPT have shown that the collective behavior of electrons in an ultrathin two-dimensional material can be detected optically, by tracking how the material responds to light. The work was published in Physical Review B and was carried out under the quantum computing roadmap overseen by Rosatom.

The team focused on a Wigner crystal, a state in which strongly cooled electrons stop behaving like a chaotic electron liquid and instead arrange themselves into a regular structure. That makes it a notable target both for fundamental physics and for applied work on materials that could later be used in quantum simulators and new electronic devices.

Optical detection in a tungsten diselenide monolayer

The experiment used a monolayer of tungsten diselenide roughly one nanometer thick — about 100,000 times thinner than a human hair. In structures that thin, effects that are hard to see in ordinary crystals can become much easier to observe.

The key result is that signatures of the electron crystal were visible through the material’s light response. Earlier observations of similar states often required either strong magnetic fields or more cumbersome measurement setups built around electrical contacts. According to the authors, the optical approach could offer a more universal way to study quantum states in thin structures, while also simplifying lab work and speeding up experimental cycles.

Why 2D materials keep drawing attention

Interest in two-dimensional materials such as graphene and transition metal dichalcogenides has been growing for years. They are a major focus in condensed matter physics, where researchers search for superconductivity, unusual magnetism, and new forms of charge transport.

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The work also has a practical angle. Classical computers struggle to simulate complex materials when thousands or millions of particles are involved, making direct calculations extremely difficult. That is one reason quantum simulators are seen as a promising alternative.

For the Russian team, the immediate value is simpler diagnostics: the easier it is to identify quantum states, the faster researchers can screen candidate structures and tune their setups. The next step is to test whether the method works on other 2D materials and on more complex quantum states.