  Spin-dependent photon echoes in combination with pump-probe Kerr rotation are
used to study the microscopic electron spin transport in a CdTe/(Cd,Mg)Te
quantum well in the hopping regime. We demonstrate that independent of the
particular spin relaxation mechanism, hopping of resident electrons leads to a
shortening of the photon echo decay time, while the transverse spin relaxation
time evaluated from pump-probe transients increases due to motional narrowing
of spin dynamics in the fluctuating effective magnetic field of the lattice
nuclei.
