Josephson coupling across magnetic topological insulator MnBi2Te4

IF 7.5 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Communications Materials Pub Date : 2024-10-08 DOI:10.1038/s43246-024-00649-3
Thies Jansen, Ekaterina Kochetkova, Anna Isaeva, Alexander Brinkman, Chuan Li
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Abstract

Topological superconductors hosting Majorana zero modes are of great interest for both fundamental physics and potential quantum computing applications. In this work, we investigate the transport properties of the intrinsic magnetic topological insulator MnBi2Te4 (MBT). In normal transport measurements, we observe the presence of chiral edge channels, though with deviations from perfect quantization due to factors such as non-uniform thickness, domain structures, and the presence of quasi-helical edge states. Subsequently, we fabricate superconducting junctions using niobium leads on MBT exfoliated flakes, which show an onset of supercurrent with clear Josephson coupling. The interference patterns in the superconducting junctions reveal interesting asymmetries, suggesting changes in the magnetic ordering of the MBT flakes under small applied magnetic fields. Moreover, the modulation of the critical current by magnetic field reveals a SQUID-like pattern, suggesting the presence of supercurrent through the quasi-helical edge states. Topological superconductors hosting Majorana zero modes are of great interest for both fundamental physics and potential quantum computing applications. Here, the intrinsic and Josephson junction transport properties of magnetic topological insulator MnBi2Te4 are investigated, revealing superconducting interference patterns that suggest the presence of supercurrent through quasi-helical edge states.

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跨磁性拓扑绝缘体 MnBi2Te4 的约瑟夫森耦合
具有马约拉纳零模的拓扑超导体对基础物理学和潜在的量子计算应用都具有重大意义。在这项工作中,我们研究了本征磁性拓扑绝缘体 MnBi2Te4(MBT)的传输特性。在正常的输运测量中,我们观察到手性边缘通道的存在,但由于厚度不均匀、畴结构和准螺旋边缘态的存在等因素,这些通道与完美的量子化存在偏差。随后,我们在 MBT 剥离薄片上使用铌引线制造了超导结,这些超导结显示了具有明显约瑟夫森耦合的超电流。超导结中的干涉图案显示出有趣的不对称性,表明 MBT 片在小外加磁场下的磁有序性发生了变化。此外,磁场对临界电流的调制显示出类似 SQUID 的模式,表明存在通过准螺旋边缘态的超电流。具有马约拉纳零模的拓扑超导体对基础物理学和潜在的量子计算应用都具有重大意义。本文研究了磁性拓扑绝缘体 MnBi2Te4 的本征和约瑟夫森结输运特性,揭示了超导干涉模式,表明通过准螺旋边缘态存在超电流。
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来源期刊
Communications Materials
Communications Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
12.10
自引率
1.30%
发文量
85
审稿时长
17 weeks
期刊介绍: Communications Materials, a selective open access journal within Nature Portfolio, is dedicated to publishing top-tier research, reviews, and commentary across all facets of materials science. The journal showcases significant advancements in specialized research areas, encompassing both fundamental and applied studies. Serving as an open access option for materials sciences, Communications Materials applies less stringent criteria for impact and significance compared to Nature-branded journals, including Nature Communications.
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