Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states

doi:10.1126/science.abf1513

GSTDTAP > 气候变化

DOI	10.1126/science.abf1513
	Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states
	Marco Valentini; Fernando Peñaranda; Andrea Hofmann; Matthias Brauns; Robert Hauschild; Peter Krogstrup; Pablo San-Jose; Elsa Prada; Ramón Aguado; Georgios Katsaros
	2021-07-02
发表期刊	Science
出版年	2021
英文摘要	Most experimental claims of Majorana bound states, unusual quasiparticles that may become the cornerstone of topological quantum computing, rest on the observation of a persistent zero bias peak (ZBP) in tunneling spectra. In semiconductor–superconductor heterostructures, this feature may also be caused by the topologically trivial Andreev bound states. Valentini et al. provide comprehensive evidence that the ZBPs observed in their experiments with semiconductor nanowires fully coated with a superconducting shell are indeed of this topologically trivial origin, in contrast to the interpretation of similar earlier experiments. The researchers identify the length of the tunnel junction in their devices as a crucial experimental parameter. Science , abf1513, this issue p. [82][1] A semiconducting nanowire fully wrapped by a superconducting shell has been proposed as a platform for obtaining Majorana modes at small magnetic fields. In this study, we demonstrate that the appearance of subgap states in such structures is actually governed by the junction region in tunneling spectroscopy measurements and not the full-shell nanowire itself. Short tunneling regions never show subgap states, whereas longer junctions always do. This can be understood in terms of quantum dots forming in the junction and hosting Andreev levels in the Yu-Shiba-Rusinov regime. The intricate magnetic field dependence of the Andreev levels, through both the Zeeman and Little-Parks effects, may result in robust zero-bias peaks—features that could be easily misinterpreted as originating from Majorana zero modes but are unrelated to topological superconductivity. [1]: /lookup/doi/10.1126/science.abf1513
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/334183
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Marco Valentini,Fernando Peñaranda,Andrea Hofmann,et al. Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states[J]. Science,2021.
APA	Marco Valentini.,Fernando Peñaranda.,Andrea Hofmann.,Matthias Brauns.,Robert Hauschild.,...&Georgios Katsaros.(2021).Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states.Science.
MLA	Marco Valentini,et al."Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states".Science (2021).