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Enhanced superconductivity in PbTe-In hybrids

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arxiv 2402.04024 v2 pith:3FFV4PC3 submitted 2024-02-06 cond-mat.mes-hall cond-mat.mtrl-scicond-mat.supr-con

Zuhan Geng , Fangting Chen , Yichun Gao , Lining Yang , Yuhao Wang , Shuai Yang , Shan Zhang , Zonglin Li
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Wenyu Song Jiaye Xu Zehao Yu Ruidong Li Zhaoyu Wang Xiao Feng Tiantian Wang Yunyi Zang Lin Li Runan Shang Qi-Kun Xue Ke He Hao Zhang
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classification cond-mat.mes-hallcond-mat.mtrl-scicond-mat.supr-con
keywords pbtesuperconductivitydevicesenhancedindiumpbte-inpresenceal-hybrids
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abstract

We report the realization of epitaxial indium thin films on PbTe nanowires. The film is continuous and forms an atomically sharp interface with PbTe. Tunneling devices reveal a hard superconducting gap. The gap size, 1.08 to 1.18 meV, is twice as large as bulk indium's ($\sim$ 0.5 meV), due to the presence of PbTe. A similar enhancement is also observed in the critical temperature of In on a PbTe substrate. Subgap peaks appear at finite magnetic fields. The effective $g$-factor (15-45) is notably enhanced compared to bare PbTe wires ($<$ 10) due to the presence of In, differing from Al-hybrids. Josephson devices exhibit gate-tunable supercurrents. The PbTe-In hybrid enhances the properties of both, the superconductivity of In and g-factors of PbTe, and thus may enable exotic phases of matter such as topological superconductivity.

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  1. Anisotropy of PbTe nanowires with and without a superconductor

    cond-mat.mes-hall 2025-01 conditional novelty 6.0 of 10

    Bare PbTe nanowires show reproducible 45-degree g-factor anisotropy, and adding a Pb superconductor rotates and gate-tunes the magnetic-field anisotropy direction.

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