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  • Letter

Topologically distinct atomic insulators

Sanjib Kumar Das1, Sourav Manna2,3, and Bitan Roy1

  • 1Department of Physics, Lehigh University, Bethlehem, Pennsylvania 18015, USA
  • 2Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel
  • 3Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel Aviv 6997801, Israel

Phys. Rev. B 108, L041301 – Published 13 July, 2023

DOI: https://doi.org/10.1103/PhysRevB.108.L041301

Abstract

Topological classification of quantum solids often (if not always) groups all trivial atomic or normal insulators (NIs) into the same featureless family. As we argue here, this is not necessarily the case always. In particular, when the global phase diagram of electronic crystals harbors topological insulators with the band inversion at various time-reversal invariant momenta KinvTI in the Brillouin zone, their proximal NIs display noninverted band-gap minima at KminNI=KinvTI. In such systems, once topological superconductors nucleate from NIs, the inversion of the Bogoliubov de Gennes bands takes place at KinvBdG=KminNI, inheriting from the parent state. We showcase this (possibly general) proposal for two-dimensional time-reversal symmetry-breaking insulators. Then, distinct quantized thermal Hall conductivity and responses to dislocation lattice defects inside the paired states (tied with KinvBdG or KminNI), in turn, unambiguously identify different parent atomic NIs.

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