  Soft leptogenesis is a mechanism which generates the matter-antimatter
asymmetry of the Universe via the out-of-equilibrium decays of heavy sneutrinos
in which soft supersymmetry breaking terms play two important roles: they
provide the required $CP$ violation and give rise to the mass splitting between
otherwise degenerate sneutrino mass eigenstates within a single generation.
This mechanism is interesting because it can be successful at the lower
temperature regime $T \lesssim 10^9$ GeV in which the conflict with the
overproduction of gravitinos can possibly be avoided. In earlier works, the
leading $CP$ violation is found to be nonzero only if finite temperature
effects are included. By considering generic soft trilinear couplings, we find
two interesting consequences: (1) the leading $CP$ violation can be nonzero
even at zero temperature realizing nonthermal $CP$ violation, and (2) the $CP$
violation is sufficient even far away from the resonant regime allowing soft
supersymmetry breaking parameters to assume natural values at around the TeV
scale. We discuss phenomenological constraints on such scenarios and conclude
that the contributions to charged lepton flavor violating processes are close
to the sensitivities of present and future experiments.
