  It has been shown that the geometric Berry-phase shift acquired by the
components of the light hole (LH) spinor during an adiabatic collision is equal
to the angular distance traveled by the wave vector. For LH, geometric
dephasing leads to equality between angular and crystal momentum relaxation
time. I will show that the same mechanism is completely ineffective for heavy
and split-off holes in bulk crystals, and in electron QSLs in spherical
nanostructures. This non-model result suggests that these carriers may be
considered as the stern candidates for implementation of dissipationless spin
currents (Spin Hall effect) and fault-tolerant qubits.
