论文标题
可调的近托筛选长度在三个不孔子旋转链的y结中
Tunable Kondo screening length at a Y-junction of three inhomogenous spin chains
论文作者
论文摘要
我们得出了拓扑昆多汉密尔顿，描述了三个交界处 XX自旋链连接到外部量子iSing链，为ISING轴具有不同的倾斜角。我们表明，自旋模型中的倾斜角在散装超导体和一维导电正常电子线之间的界面上发挥了超导顺序参数的作用。结果，不同的倾斜角会通过连接诱导非零平衡自旋（超级）电流。 我们采用重新归一化的组方法对拓扑结构模型，我们得出了平衡自旋电流的缩放公式。我们认为，通过监测近代效应引起的电流中的交叉，可以估计近藤筛选长度。特别是，我们证明了如何仅通过在应用阶段作用来调整近多长度。这使我们能够通过相应地调整倾斜角度和近叶长度来映射缩放属性。
We derive the topological Kondo Hamiltonian describing a Y junction of three XX-spin chains connected to outer quantum Ising chains with different tilting angles for the Ising axis. We show that the tilting angles in the spin models play the role of the phases of the superconducting order parameters at the interfaces between bulk superconductors and one-dimensional conducting normal electronic wires. As a result, different tilting angles induce nonzero equilibrium spin (super)currents through the junction. Employing the renormalization group approach to the topological Kondo model, we derive the scaling formulas for the equilibrium spin currents. We argue that, by monitoring the crossover in the currents induced by the Kondo effect, it is possible to estimate the Kondo screening length. In particular, we prove how it is possible to tune the Kondo length by acting on the applied phases only; this enables us to map out the scaling properties by just tuning the tilting angles and the Kondo length accordingly.
