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arXiv 2605.20437cond-mat.supr-concond-mat.mtrl-sci
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通过拓扑转化制备超导PdTe薄膜,迈向拓扑超导体

Superconducting PdTe Thin Film Via Topotactic Transformation, Toward Topological Superconductors

Rutgers University(罗格斯大学);University of Science and Technology of China(中国科学技术大学);Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences(中国科学院宁波材料技术与工程研究所);Carnegie Mellon University(卡内基梅隆大学)

Hee Taek Yi, Min Ge, Renjie Xie, Colby J. Stoddard, David H. Yi, Xiaoyu Yuan, Xiong Yao, Seongshik Oh

AI总结:

本研究通过分子束 epitaxy 制备出高质量超导PdTe薄膜,展示了其与体材料相似的超导特性,为拓扑超导体和Majorana物理提供了新平台。

摘要:

拓扑超导体(TSCs) hosting Majorana零模(MZMs)提供了一条实现容错量子计算的途径。PdTe因其拓扑表面态和合理的超导临界温度(约4.5 K)成为有前途的TSC候选材料。然而,生长具有体材料超导特性的PdTe薄膜一直具有挑战性。在此,我们展示通过分子束 epitaxy(MBE)生长出高质量的超导PdTe薄膜。这些薄膜表现出尖锐的超导转变(T_onset = 4.43 K,转变宽度为0.06 K),与体材料相当。这通过在Te不足条件下在PdTe_2缓冲层上生长Pd,从而通过拓扑转化转变为PdTe相实现。结构和输运分析确认了PdTe的NiAs型结构,以及其二维超导行为和优异的空气稳定性。这些发现表明,MBE生长的PdTe薄膜及其异质结构是拓扑超导性和Majorana物理的有前途的平台。

英文摘要:

Topological superconductors (TSCs) hosting Majorana zero modes (MZMs) offer a pathway to fault-tolerant quantum computation. PdTe is a promising TSC candidate due to its topological surface states and a reasonable superconducting critical temperature of ~4.5 K. However, it has been challenging to grow PdTe thin films with bulk-like superconducting properties. Here, we show that high-quality, superconducting PdTe thin films can be grown using molecular beam epitaxy (MBE). The films exhibit a sharp superconducting transition (T_onset = 4.43 K with transition width of 0.06 K), comparable to that of bulk crystals. This was made possible via a topotactic transformation from a PdTe_2 buffer layer to a PdTe phase by growing Pd on top under Te-deficient conditions. Structural and transport analyses confirm the NiAs-type structure of PdTe, as well as its two-dimensional superconducting behavior and excellent air stability. These findings suggest that the MBE-grown PdTe films and their heterostructures are a promising platform for topological superconductivity and Majorana physics.

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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