  In this work, we show that a giant spin current can be injected into a nodal
topological superconductor, using a normal paramagnetic lead, through a large
number of zero energy Majorana fermions at the superconductor edge. The giant
spin current is caused by the selective equal spin Andreev reflections (SESAR)
induced by Majorana fermions. In each SESAR event, a pair of electrons with
certain spin polarization are injected into the nodal topological
superconductor, even though the pairing in the bulk of the nodal superconductor
is spin-singlet s-wave. We further explain the origin of the spin current by
showing that the pairing correlation at the edge of a nodal topological
superconductor is predominantly equal spin-triplet at zero energy. The
experimental consequences of SESAR in nodal topological superconductors are
discussed.
