“…Thus, a current can be generated also for these values of the phase φ. For weak dissipation, the dependence of the average velocity on the phase φ is, in leading order, v = A sin(φ − φ 0 ), where φ 0 is a dissipation-induced symmetry-breaking phase lag which vanishes in the Hamiltonian limit [10,23,24]. Finally, in the overdamped regime, the system is invariant under the so-called supersymmetry [11] (x,p,t) → (x + λ/2, − p, − t), with λ the spatial period of the potential, for φ = π/2 + nπ , with n integer.…”