  A spin Hall current can circulate in a Corbino disk with spin-orbit
interactions in the presence of a radial charge current, without encountering
the sample edge problem. We have suggested several experiments to directly
detect and manipulate the spin Hall current in this system. A fictitious
two-dimensional magnetic monopole can be created in a Corbino disk with the
Rashba interaction by a circular charge current induced either by a spin Hall
current in the presence of a ferromagnetic junction or by a perpendicular
external magnetic field.
