Generation of single-particle excitations by time dependent impurity potential

Generation of single-particle excitations (levitons) can occur in systems of heavy quantum impurities coupled to a bath of fermions. To induce such minimal excitations on top of the Fermi energy of a one-component Fermi gas, one can use a designed time dependent impurity-bath interaction. For impurities coupled to a two-component Fermi gas with such designed interaction, a proper operation of spin rotation which mixes two-component states leads to an optimal transport from one component to the other: The counting statistics of the transport is of single particle character. In particular we find that optimization of the transport is easily achieved in the regime of narrow Feshbach resonance and identify that the leviton physics manifests even in small systems.