Transport measurements show that the beta phase of Bi4I4 conducts along its side surfaces, that this surface conduction switches off in the alpha phase, and that resistance noise near the transition is consistent with fluctuating topological domains.
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Signatures of emergent surface states across a displacive topological phase transition in Bi$_4$I$_4$
Transport measurements show that the beta phase of Bi4I4 conducts along its side surfaces, that this surface conduction switches off in the alpha phase, and that resistance noise near the transition is consistent with fluctuating topological domains.