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Measurement of Superconductivity and Edge States in Topological Superconductor Candidate TaSe3
Chinese Physics Letters ( IF 3.5 ) Pub Date : 2021-08-05 , DOI: 10.1088/0256-307x/38/7/077302
Shuai Liu 1, 2, 3 , Si-Min Nie 4 , Yan-Peng Qi 1 , Yan-Feng Guo 1 , Hong-Tao Yuan 5 , Le-Xian Yang 6, 7 , Yu-Lin Chen 1, 8, 9 , Mei-Xiao Wang 1, 9 , Zhong-Kai Liu 1, 9
Affiliation  

Topological superconductors (TSCs) have been widely investigated in recent years due to their novel physics and ability to host Majorana fermions (MFs) which are key to topological quantum computation. Despite the great interest, only a few compounds have been proposed as candidates of intrinsic TSCs, such as iron-based superconductor FeSe0.55Te0.45 and 2M-WS2. Among them, quasi-one-dimensional superconductor TaSe3 possesses fascinating properties such as its simple stoichiometry, layered nature and chemical stability. Here, using scanning tunneling microscope/spectroscopy (STM/STS), we systematically investigate the topography and electronic structure of TaSe3. Our STM/STS measurement reveals large atomically flat, defect-free surfaces suitable for the search of MF; electronic density of states consistent with our angle-resolved photoemission result and band-structure calculations, and a uniform superconducting gap with a typical size of ∼ 0.25 meV. Remarkably, additional edge states are observed in the vicinity of the terrace edge, suggesting they may have a topological origin. Our result proves the coexistence of superconductivity and topological electronic structure in TaSe3, making it an intriguing platform to investigate topological superconductivity.



中文翻译:

拓扑超导体候选 TaSe3 中超导性和边缘态的测量

近年来,拓扑超导体 (TSC) 因其新颖的物理特性和承载马约拉纳费米子 (MF) 的能力而得到广泛研究,而马约拉纳费米子 (MF) 是拓扑量子计算的关键。尽管引起了极大的兴趣,但只有少数化合物被提议作为本征 TSC 的候选物,例如铁基超导体 FeSe 0.55 Te 0.45和 2M-WS 2。其中,准一维超导体TaSe 3具有化学计量简单、层状性质和化学稳定性等迷人特性。在这里,我们使用扫描隧道显微镜/光谱学 (STM/STS),系统地研究了 TaSe 3的形貌和电子结构. 我们的 STM/STS 测量揭示了适合搜索 MF 的大型原子平面、无缺陷表面;态的电子密度与我们的角分辨光电子发射结果和能带结构计算一致,以及典型尺寸约为 0.25 meV 的均匀超导间隙。值得注意的是,在平台边缘附近观察到额外的边缘状态,表明它们可能具有拓扑起源。我们的结果证明了 TaSe 3中超导性和拓扑电子结构的共存,使其成为研究拓扑超导性的有趣平台。

更新日期:2021-08-05
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