Emerging (2+1)D Electrodynamics and Topological Instanton in Pseudo-Hermitian Two-Level Systems.

Authors

Kuangyin Deng, Ran Cheng

Published in

Physical review letters. Volume 135. Issue 12. Pages 126609. Sep 19, 2025.

Abstract

We reveal a hidden electrodynamical structure emerging from a general 2×2 pseudo-Hermitian system that exhibits real spectra. Even when the Hamiltonian does not explicitly depend on time, the Berry curvature can be mapped onto a 2+1-dimensional electromagnetic field arising from an artificial spacetime instanton, in sharp contrast to the Hermitian systems where the Berry curvature is equivalent to the static magnetic field of a magnetic monopole in three spatial dimensions. The instanton appearing as a spacetime singularity carries a topological charge that quantizes the jump of magnetic flux of the Berry curvature at the time origin. Our findings are demonstrated in a simple example related to antiferromagnetic magnons.

PMID:
41046429
Bibliographic data and abstract were imported from PubMed on 06 Oct 2025.

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