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Corner states, hinge states and Majorana modes in SnTe nanowires
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SnTe materials are one of the most flexible material platforms for exploring the interplay of topology and different types of symmetry breaking. We study symmetry-protected topological states in SnTe nanowires in the presence of various combinations of Zeeman field, s-wave superconductivity and inversion-symmetry-breaking field. We uncover the origin of robust corner states and hinge states in the normal state. In the presence of superconductivity, we find inversion-symmetry-protected gapless bulk Majorana modes, which give rise to quantized thermal conductance in ballistic wires. By introducing an inversion-symmetry-breaking field, the bulk Majorana modes become gapped and topologically protected localized Majorana zero modes appear at the ends of the wire.
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One-dimensional Dirac modes in the core of a pentagonal topological crystalline insulator nanowire
Pentagonal SnTe-class nanowires with cationic twin planes are predicted to host two spatially separated helical Dirac modes, one at the core and one at the outer surface.
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