Researchers detect superconductivity in “supermoiré lattice” graphene

When two graphene sheets are rotated relative to each other, they form what are known as moiré lattices. At certain “magic” twist angles, the electrons in these moiré lattices interact strongly, giving rise to superconductivity and insulating behavior reminiscent of that found in high-temperature superconductors. Less is known, however, about what happens when multiple moiré lattices overlap and create an even larger and even more complex (“higher order”) pattern: a supermoiré lattice.

A research team led by Ecole Polytechnique Fédérale de Lausanne (EPFL) has discovered that a “supermoiré lattice” graphene arrangement shows superconductivity and causes electrons to behave in unusual, coordinated ways. The findings could help design new kinds of quantum materials with properties never seen before.When two graphene sheets are rotated relative to each other, they form what are known as moiré lattices. At certain “magic” twist angles, the electrons in these moiré lattices interact strongly, giving rise to superconductivity and insulating behavior reminiscent of that found in high-temperature superconductors. Less is known, however, about what happens when multiple moiré lattices overlap and create an even larger and even more complex (“higher order”) pattern: a supermoiré lattice.

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