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Fractional Spin and Josephson Effect in Time-Reversal-Invariant Topological Superconductors

机译:时变不变拓扑超导体中的分数自旋和约瑟夫森效应

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Time-reversal-invariant topological superconducting (TRITOPS) wires are known to host a fractional spin h/4 at their ends. We investigate how this fractional spin affects the Josephson current in a TRITOPS-quantum dot-TRITOPS Josephson junction, describing the wire in a model that can be tuned between a topological and a nontopological phase. We compute the equilibrium Josephson current of the full model by continuous-time Monte Carlo simulations and interpret the results within an effective low-energy theory. We show that in the topological phase, the 0-to-pi transition is quenched via formation of a spin singlet from the quantum-dot spin and the fractional spins associated with the two adjacent topological superconductors.
机译:时变不变拓扑超导(TRITOPS)导线在其末端具有分数自旋h / 4。我们研究了这种分数自旋如何影响TRITOPS-量子点-TRITOPS Josephson结中的Josephson电流,从而描述了可以在拓扑和非拓扑相之间进行调整的模型中的导线。我们通过连续时间蒙特卡洛模拟计算整个模型的平衡约瑟夫森电流,并在有效的低能理论中解释结果。我们表明,在拓扑阶段,从量子点自旋和与两个相邻拓扑超导体相关的分数自旋的自旋单重态的形成,使0至pi跃迁猝灭。

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  • 来源
    《Physical review letters》 |2017年第4期|046801.1-046801.5|共5页
  • 作者单位

    Univ Buenos Aires, Dept Fis, FCEyN, Pabellon 1,Ciudad Univ, RA-1428 Caba, Argentina|IFIBA, Pabellon 1,Ciudad Univ, RA-1428 Caba, Argentina;

    ECyT UNSAM, Int Ctr Adv Studies, Campus Miguelete,25 Mayo & Francia, RA-1650 Buenos Aires, DF, Argentina;

    CNEA, Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Argentina|CNEA, Inst Balseiro, RA-8400 San Carlos De Bariloche, Argentina;

    Free Univ Berlin, Dahlem Ctr Complex Quantum Syst & Fachbereich Phy, D-14195 Berlin, Germany;

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