  We show that electric field can induce spin polarization and dichroism
effects in angle resolved photoemission spectroscopy (ARPES) in spin orbit
coupling systems. The physical origin behind the effects essentially is the
same as the spin Hall effect induced by the electric field. Since the ARPES
experiments have both energy and momentum resolutions, the spin Hall effect can
be directly verified by the ARPES experiments for individual band even if there
is no net spin current.
