Science, Space and Technology News 2023
“It is kind of like one-stop shopping,” says Long Ju, an assistant professor in the MIT Department of Physics and leader of the work, which is reported in the October 5 issue of. “Nature has plenty of surprises. In this case, we never realized that all of these interesting things are embedded in graphite.”, which is a single layer of carbon atoms arranged in hexagons resembling a honeycomb structure.
Artist’s rendition of the electron correlation, or ability of electrons to talk with each other, that can occur in a special kind of graphite . Credit: Sampson Wilcox, MIT Research Laboratory of Electronics Bulk graphite–and even single sheets of graphene–are good electrical conductors, but that’s it. The material Ju and colleagues isolated, which they call pentalayer rhombohedral stacked graphene, becomes much more than the sum of its parts.
“We found that the material could be insulating, magnetic, or topological,” Ju says. The latter is somewhat related to both conductors and insulators. Essentially, Ju explains, a topological material allows the unimpeded movement of electrons around the edges of a material, but not through the middle. The electrons are traveling in one direction along a “highway” at the edge of the material separated by a median that makes up the center of the material.
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