Resonant tunneling through a quantum dot coupled to superconducting
reservoirs in the presence of time-dependent external voltage has been studied.
A general formula of the current is derived based on the nonequilibrium Green's
function technique. Using this formula photon-assisted quasiparticle transport
has been investigated for the quantum dot connected to superconductors. In
addition, resonant Andreev transport through a strongly correlated quantum dot
connected to a normal metallic lead and a superconducting lead is studied.Comment: 9 pages(1 column) with 3 figure
