New, highly tunable composite materials—with a twist

 

New, highly tunable composite materials—with a twist
Watch for the patterns created as the circles move across each other. Those patterns, created by two sets of lines offset from each other, are called moiré (pronounced mwar-AY) effects. As optical illusions, moiré patterns create neat simulations of movement. But at the atomic scale, when one sheet of atoms arranged in a lattice is slightly offset from another sheet, these moiré patterns can create some exciting and important physics with interesting and unusual electronic properties.Mathematicians at the University of Utah have found that they can design a range of composite materials from moiré  created by rotating and stretching one lattice relative to another. Their electrical and other  can change—sometimes quite abruptly, depending on whether the resulting moiré patterns are regularly repeating or non-repeating. Their findings are published in Communications Physics.

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