  The two-fluid (ions and electrons) plasma Richtmyer-Meshkov instability of a
cylindrical light/heavy density interface is numerically investigated without
an initial magnetic field. Varying the Debye length scale, we examine the
effects of the coupling between the electron and ion fluids. When the coupling
becomes strong, the electrons are restricted to co-move with the ions and the
resulting evolution is similar to the hydrodynamic neutral fluid case. The
charge separation that occurs between the electrons and ions results in
self-generated electromagnetic fields. We show that the Biermann battery effect
dominates the generation of magnetic field when the coupling between the
electrons and ions is weak. In addition to the Rayleigh-Tayler stabilization
effect during flow deceleration, the interfaces are accelerated by the induced
spatio-temporally varying Lorentz force. As a consequence, the perturbations
develop into the Rayleigh-Taylor instability, leading to an enhancement of the
perturbation amplitude compared with the hydrodynamic case.
