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We study the AC field induced current peaks of a spin blockaded doublequantum dot with spin-orbit interaction. The AC field modulates either theinterdot tunnel coupling or the energy detuning, and we choose the AC fieldfrequency range to induce two singlet-triplet transitions giving rise to twocurrent peaks. We show that for a large detuning the two current peaks can besignificantly stronger when the AC field modulates the tunnel coupling, thusmaking the detection of the spin-orbit gap more efficient. We also demonstratethe importance of the time dependence of the spin-orbit interaction.

Microwave spectroscopy of spin-orbit coupled states: energy detuning versus interdot coupling modulation