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Untying links through anti-parity-time-symmetric coupling

H. C. Wu, X. M. Yang, L. Jin, and Z. Song
Phys. Rev. B 102, 161101(R) – Published 5 October 2020

Abstract

We reveal how the vector field links are untied under the influence of anti-parity-time-symmetric couplings in a dissipative sublattice-symmetric topological photonic crystal lattice. The topology of the quasi-one-dimensional two-band system is encoded in the geometric topology of the vector fields associated with the Bloch Hamiltonian. The linked vector fields reflect the topology of the nontrivial phase. The topological phase transition occurs concomitantly with the untying of the vector field link at the exceptional points. Counterintuitively, more dissipation constructively creates a nontrivial topology. The linking number predicts the number of topological photonic zero modes.

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  • Received 9 July 2020
  • Revised 17 September 2020
  • Accepted 21 September 2020

DOI:https://doi.org/10.1103/PhysRevB.102.161101

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalGeneral PhysicsCondensed Matter, Materials & Applied Physics

Authors & Affiliations

H. C. Wu, X. M. Yang, L. Jin*, and Z. Song

  • School of Physics, Nankai University, Tianjin 300071, China

  • *jinliang@nankai.edu.cn
  • songtc@nankai.edu.cn

Article Text

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Issue

Vol. 102, Iss. 16 — 15 October 2020

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