  In this Letter, we introduce leptogenesis via a varying Weinberg operator
from a semi-classical perspective. This mechanism is motivated by the breaking
of an underlying symmetry which triggers a phase transition that causes the
coupling of the Weinberg operator to become dynamical. Consequently, a lepton
anti-lepton asymmetry arises from the interference of the Weinberg operator at
two different spacetime points. Using this semi-classical approach, we treat
the Higgs as a background field and show a reflection asymmetry between the
leptons and anti-leptons is generated in the vicinity of the bubble wall. We
solve the equations of motion of the lepton and anti-lepton quasiparticles to
obtain the final lepton asymmetry.
