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arXiv 1604.03066cond-mat.supr-concond-mat.mes-hall
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外尔超导体NS结中的散粒噪声

Shot noise in NS junctions with Weyl superconductor

A. Golub

摘要:

我们证明,电流-电流关联(特别是散粒噪声),可以用来研究本征超导性在一个轻微的掺杂外尔半金属。所研究的系统是一个N-WS隧穿结,其中左电极是正常金属,而右电极是Weyl超导体(WS)。超导电性支持具有交叉平带的表面态,从而影响低能谱。该光谱显示了在间隙区域中的修改的态密度,其强烈地影响N-WS结的传输特性。的Fano因子计算作为所施加的偏压的函数,并示出基本上取决于WS的表面相对于隧穿方向的取向。如果这种取向支持低能量状态的发生,则散粒噪声功率随着电压的降低而降低,这一性质类似于在具有马约拉纳束缚态的结中普遍存在的性质。

英文摘要:

We demonstrate that current-current correlations (in particular the shot noise), can be used to study the intrinsic superconductivity in a slightly doped Weyl semi-metal. The systems studied is an N-WS tunneling junction where the left electrode is a normal metal while the right electrode is a Weyl superconductor (WS). The superconductivity supports surface state with crossed flat bands thereby impact the low energy spectrum. This spectrum displays a modified density of states in the gap region that strongly affects transport characteristics of the N-WS junction. The Fano factor is calculated as function of the applied bias, and shown to be dependent essentially on the orientation of the surface of WS relative to the tunneling direction. If this orientation supports the occurrence of low energy state, then the shot noise power decreases with decreasing voltage, a property similar to that prevailing in a junction with Majorana bound state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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