  Dynamic manipulation of the surface plasmon polariton (SPP) and wave steering
are important in plasmonic applications. In this work, we excite a curved SPP
in topological continua by applying a radial magnetic bias. We believe that it
is a new technique to create a unidirectional SPP traveling along a curved
trajectory. We also derive a Greens function model for radially-biased plasma,
applicable to curved SPPs. We compare the properties of unidirectional curved
SPPs with the usual case when an axial bias is applied.
