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(Funded in part by the U.S. Department of Energy and the National Science Foundation)
Scientists from the U.S. Department of Energy’s Brookhaven National Laboratory, the University of Pennsylvania, the University of New Hampshire, the Chinese University of Hong Kong, Stony Brook University, and Columbia University have detected electronic and optical interlayer resonances in two different configurations of bilayer graphene—the two-dimensional (2D), atom-thin form of carbon. They found that twisting one of the graphene layers by 30 degrees relative to the other, instead of stacking the layers directly on top of each other, shifts the resonance to a lower energy. From this result, they deduced that the distance between the two layers increased significantly in the twisted configuration, compared to the stacked one.
