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We study the nonequilibrium transport through a quantum dot coupled to normaland superconducting leads. We use the modified second-order perturbation theoryto calculate the differential conductance and the local density of states atthe quantum dot. In the strong but finite Coulomb interaction regime, thedifferential conductance shows an anomalous peak not at a zero bias voltage butat a finite bias voltage. We also observe an additional Kondo resonance besidesthe normal one in the local density of states, where the former is caused bynonequilibrium Andreev tunneling via the normal Kondo resonance. We explainthat this specific Andreev tunneling gives rise to the anomalous peak in thedifferential conductance. Since the Andreev tunneling via the Kondo resonanceis suppressed with increasing temperature, the anomalous peak in thedifferential conductance disappears at high temperatures.

Enhanced Andreev Tunneling via the Kondo Resonance in a Quantum Dot at Finite Bias