Anomalous skew scattering of plasmons in a Dirac electron fluid

The Berry phase-related nontrivial electronic band geometries can significantly influence bulk and edge plasmons, resulting in their nonreciprocal propagation and opening unique opportunities for plasmonics. In the present paper, we extend the hydrodynamic framework to describe the scattering of plasmons in a Dirac electron fluid off a circular region with an induced nonzero anomalous Hall response, i.e., a Berry flux target. We demonstrate that the scattering has a giant asymmetry or skewness and exhibits a series of resonances. The latter appears due to a chiral nontopological trapped mode circulating the target. We discuss possible experimental realizations, including the surface of a topological insulator film and graphene irradiated by the circularly polarized beam.