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The search for one-dimensional (1D) topologically-protected electronic stateshas become an important research goal for condensed matter physics owing totheir potential use in spintronic devices or as a building block fortopologically non-trivial electronic states. Using low temperature scanningtunneling microscopy, we demonstrate the formation of 1D electronic states attwin boundaries at the surface of the noncentrosymmetric material BiPd. Thesetwin boundaries are topological defects which separate regions withantiparallel orientations of the crystallographic \textit{b} axis. Wedemonstrate that the formation of the 1D electronic states can be rationalizedby a change in effective mass of two-dimensional surface states across the twinboundary. Our work therefore reveals a novel route towards designing 1Delectronic states with strong spin-orbit coupling.

Kinetic stabilization of 1D surface states near twin boundaries in noncentrosymmetric BiPd