Topic:
Twin boundaries in FeSe preferentially attract superconducting vortices. The resulting incommensurate potential produces regular 2D and 1D vortex lattices, precisely variable intervortex distance, and profound geometric size effects.
Control over vortex interactions is crucial to quantum information devices. Our findings open an intrinsic path to control of vortex geometry, bypassing damaging lithography in favor of topological defects and self-organization.
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