Observation of non-Hermitian antichiral edge currents

Abstract

Non-Hermitian topological photonics is of great interest in bridging topological matter with gain/dissipation engineering in optics. A key problem in this direction is the interplay between the effective gauge potential and the non-Hermiticity. Here we tackle this problem in a synthetic non-Hermitian Hall ladder and experimentally observe antichiral edge currents (ACECs) of photons, by tuning the locally uniform effective magnetic flux and the on-site gain/loss. Such ACECs provide a topological method to probe the signatures of the non-Hermitian skin effect (NHSE) from steady-state bulk dynamics. The universality of this method is verified by its generalization to three dimensions. This study paves a way to investigate exotic non-Hermitian topological physics and has potential applications in topological photonics engineering.

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Cited by in corpus (7)

• A comprehensive review on developments of synthetic dimensions
• Probing Bulk Band Topology from Time Boundary Effect in Synthetic Dimension
• Construction of various time-dependent Hamiltonians on a single photonic chip
• Creating high-dimensional topological physics using a single ring resonator
• Observation of Braid-Protected Unpaired Exceptional Points
• Experimental observation of energy-band Riemann surface
• Dynamics of interacting bosons in a two-leg ring ladder with artificial magnetic flux and ac-driven modulations