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首页> 外文期刊>Physical review >Andreev reflection at the interface of a normal Weyl semimetal and a superconducting type-Ⅱ Weyl semimetal
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Andreev reflection at the interface of a normal Weyl semimetal and a superconducting type-Ⅱ Weyl semimetal

机译：Andreev反射在正常Weyl半型和超导Ⅱ型Weyl半决面的界面处

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摘要

We study Andreev reflection at the interface of a time-reversal invariant Weyl semimetal without band tilting in the normal or ferromagnetic slate with a type-Ⅱ Weyl semimetal possessing an ovcrtilted anisotropic energy spectrum in the superconducting state. We find that the Andreev reflection at the normal-superconductor interface is tremendously anisotropic. reflecting the anisotropic energy spectrum of the type-Ⅱ Weyl semimetal. There is a critical junction direction relative to the band tilling direction which, below it, the Andreev reflection acquires distinct properties without any other counterpart. Further, the conductance of this junction is constant and independent of the energy at subgap energies in two extreme limits of the zero and infinite chemical potentials. We can attribute them to the perfect specular and retro Andreev reflections, respectively. In particular, we find a universal value for the zero-energy conductance independent of the chemical potential on each side of the junction. At the interface of the ferromagnet-superconductor, the Andreev reflection can be switched between the specular and retro regimes by varying the exchange energy. This results in different asymptotic values for conductance at high exchange energies depending on if the junction direction is below or above the critical direction. Moreover, we see that tunneling conductance of the normal-ferromagnet-superconductor junction in the thin barrier limit is independent of the potential barrier strength, while it periodically oscillates in terms of the exchange barrier strength. Furthermore, we find a π/4 phase shift in the periodic oscillation of the conductance of the junctions with directions below and above the critical direction. This highly anisotropic conductance of the junctions studied here can be used as a way. accompanied by the other methods, for detecting the anisotropic spectrum and band-tilting direction of type-Ⅱ Weyl semimetals.
机译：我们在时间反转不变Weyl半型界面的界面中研究了Andreev反射，没有在正常或铁磁性板岩中的带倾斜，具有在超导状态下具有OVCRTILTED各向异性能谱的Ⅱ型Weyl半型。我们发现正常超导界面处的Andreev反射是极致的各向异性的。反映Ⅱ型Weyl半型的各向异性能谱。相对于带耕断方向存在关键的结向方向，该带耕断方向在其下方，AndreeV反射获取无任何其他对应物的不同特性。此外，该结的电导是恒定的，并且与零和无限化学电位的两个极限限制的副极限处的能量无关。我们可以分别将它们归因于完美的镜面和复古和复古的andreev反射。特别是，我们发现零能量电导的普遍值与结合点的每一侧的化学电位无关。在铁磁素超导体的界面处，通过​​改变交换能量，可以在镜面和复古制度之间切换Andreev反射。这导致在高交换能量下电导的不同渐近值，这取决于结向方向低于或高于临界方向。此外，我们看到较薄的屏障极限中的正常铁磁 - 超导结的隧道电导与电位屏障强度无关，同时在交换屏障强度方面周期性地振荡。此外，我们在连续振荡的周期性振荡中找到π/ 4相移，其中的指示低于临界方向。这里研究的结的这种高度各向异性的电导可以用作一种方式。伴随着其他方法，用于检测Ⅱ型Weyl半型的各向异性光谱和带倾斜方向。

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  • 来源
    《Physical review》 |2020年第2期|024512.1-024512.14|共14页
  • 作者

    Alireza Azizi; Babak Abdollahipour;

  • 作者单位

    Department of Condensed Matter Physics Faculty of Physics University of Tabriz Tabriz 51666-16471 Iran;

    Department of Condensed Matter Physics Faculty of Physics University of Tabriz Tabriz 51666-16471 Iran;

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