In a model graphene/hBN/hBN moiré, the Berry dipole vector field winds through the moiré and takes only six symmetry-allowed directions.
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Winding Berry dipole on uniaxially strained graphene/hBN/hBN moir\'e trilayers
In a model graphene/hBN/hBN moiré, the Berry dipole vector field winds through the moiré and takes only six symmetry-allowed directions.