对“外尔半金属TaAs上尖端诱导的非常规超导性“的评论[ arXiv：1607.00513]
Comment on "Tip induced unconventional superconductivity on Weyl semimetal TaAs" [arXiv:1607.00513]
摘要：
最近，Wang $et$ $al.$报道了在Weyl半金属TaAs中观察到“非常规超导性”[arXiv：1607.00513]。作者写了“\textit{A conductance plateau and sharp double dips are observed in the point contact spectra, indicating p-wave like unconventional superconductivity. Furthermore, the zero bias conductance peak in low temperature regime is detected, suggesting potentially the existence of Majorana zero modes. The experimentally observed tunneling spectra can be interpreted with a novel mirror-symmetry protected topological superconductor induced in TaAs, which can exhibit zero bias and double finite bias peaks, and double conductance dips in the measurements} .“在这篇评论中，我们表明，对于超导点接触，由于简单的接触加热相关效应，可能会出现零偏压电导峰，平台和单个或多个电导下降等特征。当实验不是在介观输运的正确状态下进行时，在涉及各种超导体的点接触中经常观察到这些特征。我们还表明，由王$et$ $al.$在一个单一的点接触传输制度的数据不确认尖端诱导超导（TISC）。即使假设Wang $et$ $al.$在TaAs上实现了TISC，他们报告的所有光谱都显示出与热传输区预期的光谱类型惊人的相似性。这些数据不能用于提取任何光谱信息，基于这些数据，任何关于“p波”超导性或马约拉纳模式出现的讨论都应被视为无效。此版本（v2）还包括对Wang $et$ $al.$对本评论第一版（v1）的回应的简要讨论。关于TaAs点接触的正确弹道状态数据可以在arXiv：1607.05131（2016）中找到。
英文摘要：
Recently, Wang $et$ $al.$ have reported the observation of "unconventional superconductivity" in the Weyl semimetal TaAs [arXiv:1607.00513]. The authors have written "\textit{A conductance plateau and sharp double dips are observed in the point contact spectra, indicating p-wave like unconventional superconductivity. Furthermore, the zero bias conductance peak in low temperature regime is detected, suggesting potentially the existence of Majorana zero modes. The experimentally observed tunneling spectra can be interpreted with a novel mirror-symmetry protected topological superconductor induced in TaAs, which can exhibit zero bias and double finite bias peaks, and double conductance dips in the measurements}." In this comment we show that for a superconducting point contact, the features like a zero-bias conductance peak, a plateau and single or multiple conductance dips might arise due to simple contact-heating related effects. Such features are routinely observed in point contacts involving a wide variety of superconductors when the experiments are not performed in the right regime of mesoscopic transport. We also show that the data presented by Wang $et$ $al.$ in a single transport regime of point contact do not confirm tip induced superconductivity (TISC). Even if it is assumed that Wang $et$ $al.$ achieved TISC on TaAs, all the spectra that they have reported show striking similarities with the type of spectra expected in thermal regime of transport. Such data cannot be used for extracting any spectroscopic information and based on such data any discussion on "p-wave" superconductivity or the emergence of Majorana modes should be considered invalid. This version (v2) also includes a brief discussion on the response of Wang $et$ $al.$ to the first version (v1) of this comment. Correct ballistic regime data on TaAs point contacts can be found in arXiv:1607.05131 (2016).
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。
