![]() ![]() That’s when the material is not an insulator. “If we don’t have one electron per hexagon, but instead have 95% occupancy of hexagons, meaning some nearby hexagons are empty, then the electrons can still move around a little through the empty cells. “If the hexagons can be imagined to be homes, all the electrons are indoors, one per home, and not moving about in the neighborhood,” he said. The system then behaves like an insulator.”Ĭui likened the behavior of such electrons to social distancing during a pandemic. ![]() “When the number of electrons is such that one electron occupies every moiré hexagon, the electrons stay locked in place and cannot move freely anymore. “The electrons do not want to stay close to each other,” said Xiong Huang, the first author of the paper and a doctoral graduate student in Cui’s Microwave Nano-Electronics Lab. Cui’s lab found that when moiré lattices are formed using both WS 2 and WSe 2, resulting in a periodic pattern, the electrons begin to slow down and repel from each other. Typically, when a small number of electrons are placed in a 2D layer such as WS 2 or WSe 2, they have enough energy to travel freely and randomly, making the system a conductor. “Further, coupling between electrons becomes strong, meaning the electrons ‘talk to each other’ while moving around across the ridges and the wells.” “WS 2 and WSe 2 have a slight mismatch where lattice size is concerned, making them ideal for producing moiré patterns,” Cui said. The moiré patterns generated on the composite material of WS 2 and WSe 2 can be imagined to be with wells and ridges arranged similarly in a honeycomb pattern. Occupation patterns for various electron occupancy levels in the moiré lattice. ![]()
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