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arXiv 1807.07259cond-mat.supr-con
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二维极限下高温超导体的零能束缚态

Zero-energy bound states in the high-temperature superconductors at the two-dimensional limit

Chaofei Liu, Cheng Chen, Xiaoqiang Liu, Ziqiao Wang, Yi Liu, Shusen Ye, Ziqiang Wang, Jiangping Hu, Jian Wang

摘要:

服从非阿贝尔统计的Majorana零模在拓扑量子计算中有着广泛的应用前景。在隧穿实验中识别MZM存在的主要信号是零能束缚态(ZEBSs)。然而,几乎所有先前报道的显示MZM特征的ZEBSs都是在非常低的温度下在难以制造的异质结构中观察到的,并且另外需要施加磁场。在这里,通过使用原位扫描隧道光谱,我们检测到ZEBSs的间隙Fe吸附原子沉积在两个不同的高温超导一个晶胞厚度的铁硫属化物SrTiO 3(001)。光谱结果类似于拓扑超导体涡旋核内MZM的唯象特征。我们的实验结果可能会扩大MZM探索在先天拓扑超导体对一个适用的温度制度,并下降到二维极限。虽然缺乏对观测结果的具体理解,但可能的解释包括具有自旋轨道耦合的新型2D超导态,磁性位点处异常涡旋的自发成核以及非共面磁性有序,这可能进一步激发对具有多带库珀配对的强关联系统中几乎没有捕获的ZEBSs的理论理解。

英文摘要:

Majorana zero modes (MZMs) that obey the non-Abelian statistics have been intensively investigated for potential applications in topological quantum computing. The prevailing signals in tunneling experiments "fingerprinting" the existence of MZMs are the zero-energy bound states (ZEBSs). However, nearly all of the previously reported ZEBSs showing signatures of the MZMs are observed in difficult-to-fabricate heterostructures at very low temperatures and additionally require applied magnetic field. Here, by using in-situ scanning tunneling spectroscopy, we detect the ZEBSs upon the interstitial Fe adatoms deposited on two different high-temperature superconducting one-unit-cell-thick iron chalcogenides on SrTiO3(001). The spectroscopic results resemble the phenomenological characteristics of the MZMs inside the vortex cores of topological superconductors. Our experimental findings may extend the MZM explorations in connate topological superconductors towards an applicable temperature regime and down to the two-dimensional limit. While a concrete understanding of the observations is lacking, possible explanations involving novel 2D superconducting states with spin-orbit coupling, spontaneous nucleation of anomalous vortices at the magnetic sites, and noncoplanar magnetic ordering may further stimulate theoretical understandings of the scarcely captured ZEBSs in strongly correlated systems with multiband Cooper pairing.

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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