Microwave spectroscopy of spin–orbit coupled states: Energy detuning vs interdot coupling modulation

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  • G. Giavaras
    Faculty of Pure and Applied Sciences, University of Tsukuba 1 , Tsukuba 305-8571, Japan
  • Yasuhiro Tokura
    Faculty of Pure and Applied Sciences, University of Tsukuba 1 , Tsukuba 305-8571, Japan

Abstract

<jats:p>We study the AC field induced current peaks of a spin-blockaded double quantum dot with spin–orbit interaction. The AC field modulates either the interdot tunnel coupling or the energy detuning, and we choose the AC field frequency range to induce two singlet–triplet transitions giving rise to two current peaks. We show that for a large detuning, the two current peaks can be significantly stronger when the AC field modulates the tunnel coupling, thus making the detection of the spin–orbit gap more efficient. We also demonstrate the importance of the time dependence of the spin–orbit interaction.</jats:p>

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