Monopole-antimonopole instability in non-Hermitian coupled waveguides

Rosie Hayward*, Fabio Biancalana

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A non-Hermitian coupled waveguide system with periodically varying parameters, in which the Berry curvature is analogous to a hyperbolic magnetic monopole or antimonopole, is investigated. It is shown to have a purely imaginary Berry connection and is consequently influenced by a geometric multiplier. It is possible for this multiplier to induce net gain or loss in the system, corresponding to the existence of the antimonopole or monopole in parameter space, respectively. For the right choice of parameters, the system will display an apparent nonadiabatic change in behavior, which implies a switch between the dominant eigenstate in the waveguides, leading to a change in parameter space analogous to a charge reversal of the hyperbolic magnetic monopole.

Original languageEnglish
Article number043846
JournalPhysical Review A
Issue number4
Publication statusPublished - 29 Apr 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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