We predict a plasmonic excitation that exhibits chiral properties in the absence of external magnetic field. This excitation, that we call an interedge chiral Berry plasmon (IE CBP), is bound to an interface between two two-dimensional electron systems with different anomalous Hall conductivities. Crucially, the IE CBP is a unidirectional mode whose propagation direction and frequency are susceptible to external control, in sharp contrast to state-of-the-art magnetic field-free devices. We believe that the IE CBP represents a unique platform for tunable backscattering-immune signal transmission in the absence of magnetic field.

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• Geometric & topological phases
• Optoelectronics
• Plasma oscillations
• Plasmonics