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arXiv 1502.07521cond-mat.mes-hall
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具有巨轨道g因子的超导量子自旋霍尔系统

Superconducting quantum spin-Hall systems with giant orbital g-factors

R. W. Reinthaler, G. Tkachov, E. M. Hankiewicz

摘要:

量子自旋霍尔系统(QSHS)中超导性的拓扑方面是当前研究的焦点,例如三维拓扑绝缘体(3D Tis)或二维Tis的薄层。我们研究了外磁场中的混合QSHS/超导体结构,并预测了具有保护边缘模的无带隙超导态。它完全起源于电子自旋锁定到超导凝聚流的动量所引起的轨道磁场效应。我们表明,这样的自旋动量锁定可以产生一个巨大的轨道g因子的顺序为几百个,允许一个实现显着的自旋极化在QSHS中的领域远低于超导材料的临界场。我们提出了一个三端设置中,自旋极化的边缘超导性可以探测Andreev反射,导致不寻常的传输特性:非单调的过剩电流和零偏置电导分裂的塞曼相互作用的情况下。

英文摘要:

Topological aspects of superconductivity in quantum spin-Hall systems (QSHSs) such as thin layers of three-dimensional topological insulators (3D Tis) or two-dimensional Tis are in the focus of current research. We examine hybrid QSHS/superconductor structures in an external magnetic field and predict a gapless superconducting state with protected edge modes. It originates entirely from the orbital magnetic-field effect caused by the locking of the electron spin to the momentum of the superconducting condensate flow. We show that such spin-momentum locking can generate a giant orbital g-factor of order of several hundreds, allowing one to achieve significant spin polarization in the QSHS in the fields well below the critical field of the superconducting material. We propose a three-terminal setup in which the spin-polarized edge superconductivity can be probed by Andreev reflection, leading to unusual transport characteristics: a non-monotonic excess current and a zero-bias conductance splitting in the absence of the Zeeman interaction.

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