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One-dimensional topology and topolectrics of nonsymmorphic Kramers degenerate systems

Max Tymczyszyn and Edward McCann*

  • *Contact author: ed.mccann@lancaster.ac.uk
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Phys. Rev. B 113, 155422 – Published 13 April, 2026

DOI: https://doi.org/10.1103/jlf9-qgyz

Abstract

We describe nonsymmorphic four-band tight-binding models in one dimension with Kramers degeneracy, and propose topolectric-circuit realizations of their topological phases. We begin with a representative model in the nonsymmorphic AII class with symmorphic time-reversal symmetry and nonsymmorphic charge-conjugation and chiral symmetries, resulting in a Z2 invariant. We also provide a Bogoliubov-de Gennes model in the nonsymmorphic D class with symmorphic charge-conjugation symmetry and nonsymmorphic time-reversal and chiral symmetries, which support a Z4 classification. To compute these invariants, we extend an open-path winding-number formulation previously used for non-Kramers-degenerate nonsymmorphic Z2 phases to Kramers-degenerate four-band systems. We propose topolectric-circuit implementations of nonsymmorphic systems, beginning with a comparison between the symmorphic Su-Schrieffer-Heeger and nonsymmorphic charge-density-wave models. We then extend this methodology to topolectric realizations of the AII and Z4 models, finding that the impedance response reproduces the predicted phase boundaries and associated zero-energy modes. Finally, we analyze disorder in the Z4 model and find that, although disorder breaks the nonsymmorphic symmetries, certain domain-wall zero modes in the minimal nearest-neighbor model remain pinned at zero energy because the disorder has no first-order coupling to the soliton subspace; longer-range terms satisfying relevant symmetries lift this emergent property.

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Phys. Rev. B 113, 155422– Published 13 April, 2026
  • Received 13 November 2025
  • Revised 6 March 2026
  • Accepted 30 March 2026
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