arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2304.08142cond-mat.mes-hallcond-mat.str-elcond-mat.supr-con
收藏

范德华异质结中的一维拓扑超导

One-dimensional topological superconductivity in a van der Waals heterostructure

Jose Martinez-Castro, Tobias Wichmann, Keda Jin, Tomas Samuely, Zhongkui Lyu, Jiaqiang Yan, Oleksander Onufriienko, Pavol Szabó, F. Stefan Tautz, Markus Ternes, Felix Lüpke

AI总结:

本文通过在NbSe₂上放置单层WTe₂构建范德华异质结,利用扫描隧道显微镜直接探测超导性质,证实了一维拓扑超导的存在,并发现其边缘态对磁场鲁棒且由横向自邻近效应保护,为马约拉纳束缚态的实现提供了平台。

摘要:

一维(1D)拓扑超导是一种自然界中不存在的物质状态。然而,它可以通过例如将超导性诱导到二维拓扑绝缘体的量子自旋霍尔边缘态中来实现。由于拓扑超导体被认为可以承载马约拉纳零能模,它们被提议作为拓扑量子计算的平台。然而,一维拓扑超导的决定性证据仍然难以获得。在此,我们利用低温扫描隧道显微镜,通过直接探测其超导性质,而不是依赖于在其边界处观测马约拉纳零能模,展示了范德华异质结中的一维拓扑超导。我们通过将二维拓扑绝缘体单层WTe$_2$置于超导体NbSe$_2$上来实现这一点。我们发现超导拓扑边缘态对磁场具有鲁棒性,这是其三重态配对的标志。其拓扑保护由横向自邻近效应支撑,该效应对单层边缘中的无序具有韧性。通过在范德华异质结中创造这种奇异状态,我们为未来实现马约拉纳束缚态提供了一个可适应的平台。最后,我们的结果更普遍地证明了阿布里科索夫涡旋作为纳米结构中超导性的有效实验探针的能力。

英文摘要:

One-dimensional (1D) topological superconductivity is a state of matter that is not found in nature. However, it can be realised, for example, by inducing superconductivity into the quantum spin Hall edge state of a two-dimensional topological insulator. Because topological superconductors are proposed to host Majorana zero modes, they have been suggested as a platform for topological quantum computing. Yet, conclusive proof of 1D topological superconductivity has remained elusive. Here, we employ low-temperature scanning tunnelling microscopy to show 1D topological superconductivity in a van der Waals heterostructure by directly probing its superconducting properties, instead of relying on the observation of Majorana zero modes at its boundary. We realise this by placing the two-dimensional topological insulator monolayer WTe$_2$ on the superconductor NbSe$_2$. We find that the superconducting topological edge state is robust against magnetic fields, a hallmark of its triplet pairing. Its topological protection is underpinned by a lateral self-proximity effect, which is resilient against disorder in the monolayer edge. By creating this exotic state in a van der Waals heterostructure, we provide an adaptable platform for the future realization of Majorana bound states. Finally, our results more generally demonstrate the power of Abrikosov vortices as effective experimental probes for superconductivity in nanostructures.

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。

↑