When Material Goes Quantum, Electrons Slow Down and Form a Crystal

Moiré patterns can occur when scientists stack two-dimensional crystals with mismatched atomic spacings. Moiré superlattices display exotic physical properties that are absent in the layers that make up the patterns. Researchers have discovered a new property in the moiré superlattices formed in tungsten diselenide/tungsten disulfide crystals, in which the electrons “freeze” and form an ordered array.