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Tunability of Andreev levels via spin-orbit coupling in Zeeman-split Josephson junctions

机译：在塞曼分裂约瑟夫森结中通过自旋轨道耦合实现安德列夫能级的可调谐性

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摘要

We study Andreev reflection and Andreev levels s in Zeeman-split superconductor/Rashba wire/Zeeman split superconductor junctions by solving the Bogoliubov-de Gennes equation. We theoretically demonstrate that the Andreev levels e can be controlled by tuning either the strength of Rashba spin-orbit interaction or the relative direction of the Rashba spin-orbit interaction and the Zeeman field. In particular, it is found that the magnitude of the band splitting is tunable by the strength of the Rashba spin-orbit interaction and the length of the wire, which can be interpreted by a spin precession in the Rashba wire. We also find that if the Zeeman field in the superconductor has the component parallel to the direction of the junction, the ℓ-ф curve becomes asymmetric with respect to the superconducting phase difference ф>. Whereas the Andreev reflection processes associated with each pseudospin band are sensitive to the relative orientation of the spin-orbit field and the exchange field, the total electric conductance interestingly remains invariant.
机译：通过求解Bogoliubov-de Gennes方程，我们研究了Zeeman分裂超导体/ Rashba线/ Zeeman分裂超导体结中的Andreev反射和Andreev能级s。我们从理论上证明，可以通过调整Rashba自旋轨道相互作用的强度或Rashba自旋轨道相互作用与Zeeman场的相对方向来控制Andreev能级e。特别地，发现通过Rashba自旋轨道相互作用的强度和导线的长度可以调节带分裂的大小，这可以由Rashba导线中的自旋进动来解释。我们还发现，如果超导体中的塞曼场具有平行于结方向的分量，则ℓ-ф曲线相对于超导相位差Φ>变得不对称。尽管与每个伪自旋带相关的安德列夫反射过程对自旋轨道场和交换场的相对取向敏感，但有趣的是总电导率保持不变。

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  • 来源
    《Physical review》 |2017年第13期|134508.1-134508.9|共9页
  • 作者

    Tatsuki Hashimoto; Alexander A. Golubov; Yukio Tanaka; Jacob Linder;

  • 作者单位

    Faculty of Science and Technology and MESA+ Institute of Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands,Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan;

    Faculty of Science and Technology and MESA+ Institute of Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands,Moscow Institute of Physics and Technology, Dolgoprudny, Moscow 141700, Russia;

    Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan;

    Department of Physics, NTNU, Norwegian University of Science and Technology, N-7491 Trondheim, Norway,Center of Excellence QuSpin, NTNU, Norwegian University of Science and Technology, N-7491 Trondheim, Norway;

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