Credit: Microwave Nano-Electronics Lab, UC Riverside. RIVERSIDE, Calif. -- Materials having excess electrons are typically conductors. However, moiré patterns -- interference patterns that typically arise when one object with a repetitive pattern is placed over another with a similar pattern -- can suppress electrical conductivity, a study led by physicists at the University of California, Riverside, has found. In the lab, the researchers overlaid a single monolayer of tungsten disulfide (WS 2) on a single monolayer of tungsten diselenide (WSe 2) and aligned the two layers against each other to generate large-scale moiré patterns. The atoms in both the WS 2 and WSe