Exotic Matter Uncovered: Physicists Stumble Upon a Material Composed of Bosons — Take a lattice — a flat se |
his new, third pattern is a moiré, and it’s between this type of overlapping arrangement of lattices of tungsten diselenide and tungsten disulfide where UC Santa Barbara physicists found some interesting material behaviors.
Subatomic particles come in one of two broad types: fermions and bosons. One of the biggest distinctions is in their behavior, Jin said. A clue to their distinct behaviors is in their different quantum mechanical characteristics, Xiong explained. Fermions have half-integer “spins” such as 1/2 or 3/2, while bosons have whole integer spins . An exciton is a state in which a negatively charged electron is bound to its positively charged opposite “hole” , with the two half-integer spins together becoming a whole integer, creating a bosonic particle.
“What happened here is that we discovered the correlation that drove the bosons into a highly ordered state,” Xiong added. Generally, a loose collection of bosons under ultracold temperatures will form a condensate, but in this system, with both light and increased density and interaction at relatively higher temperatures, they organized themselves into a symmetric solid and charge-neutral insulator.
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