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- W2892905938 abstract "In addition to novel surface states, topological insulators can also exhibit robust gapless states at crystalline defects. Step edges constitute a class of common defects on the surface of crystals. In this work we establish the topological nature of one-dimensional (1D) bound states localized at step edges of the [001] surface of a topological crystalline insulator (TCI) Pb$_{0.7}$Sn$_{0.3}$Se, both theoretically and experimentally. We show that the topological stability of the step edge states arises from an emergent particle-hole symmetry of the surface low-energy physics, and demonstrate the experimental signatures of the particle-hole symmetry breaking. We also reveal the effects of an external magnetic field on the 1D bound states. Our work suggests the possibility of similar topological step edge modes in other topological materials with a rocks-salt structure." @default.
- W2892905938 created "2018-10-05" @default.
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- W2892905938 date "2019-04-08" @default.
- W2892905938 modified "2023-10-16" @default.
- W2892905938 title "Topological nature of step-edge states on the surface of the topological crystalline insulator Pb0.7Sn0.3Se" @default.
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- W2892905938 doi "https://doi.org/10.1103/physrevb.99.155116" @default.
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