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.
@article{arxiv.2105.11489,
title = {Corner states, hinge states and Majorana modes in SnTe nanowires},
author = {Nguyen Minh Nguyen and Wojciech Brzezicki and Timo Hyart},
journal= {arXiv preprint arXiv:2105.11489},
year = {2022}
}