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Mapping of surface currents of a Sb 2 Te 3 single crystal showing that the 3 x 3 rectangular grid sections, which were modified by the ion beam, are less conducting. Each square received a sequentially increasing ion beam fluence from low dose (top right square) to high dose (bottom left square) ranging from 3.74 x 10 13 ions/cm 2 to 1.12 x 10 16 ions/cm 2 (see Supplementary Information for the details) The measurement bias was 2.5 V.

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