Light Unlocks Secrets of Elusive Wigner Crystal

Researchers have discovered a new method to study Wigner crystals, an exotic state of matter where electrons form a crystal lattice. By illuminating a single atomic layer of tungsten diselenide and analyzing reflected light, scientists observed unique optical features. These features reveal the collective behavior and motion of electrons within the Wigner crystal, which had been challenging to investigate directly. This advancement was achieved by studying Wigner crystal polarons, hybrid quasiparticles formed by electrons and light-induced excitations. The strength of electron interactions was found to influence the observed optical signals, offering insights into strongly correlated systems. Theoretical work supported these experimental findings, explaining the formation of these quasiparticles. This new optical approach provides a powerful tool for understanding the hidden dynamics of ordered quantum states and complex many-body physics.