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Superconductivity in Single-Quintuple-Layer Bi2Te3 Grown on Epitaxial FeTe

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journal contribution
posted on 30.03.2020, 22:29 authored by Hailang Qin, Bin Guo, Linjing Wang, Meng Zhang, Bochao Xu, Kaige Shi, Tianluo Pan, Liang Zhou, Junshu Chen, Yang Qiu, Bin Xi, Iam Keong Sou, Dapeng Yu, Wei-Qiang Chen, Hongtao He, Fei Ye, Jia-Wei Mei, Gan Wang
How an interfacial superconductivity emerges during the nucleation and epitaxy is of great importance not only for unveiling the physical insights but also for finding a feasible way to tune the superconductivity via interfacial engineering. In this work, we report the nanoscale creation of a robust and relatively homogeneous interfacial superconductivity (TC ≈ 13 K) on the epitaxial FeTe surface, by van der Waals epitaxy of single-quintuple-layer topological insulator Bi2Te3. Our study suggests that the superconductivity in the Bi2Te3/FeTe heterostructure is generated at the interface and that the superconductivity at the interface does not enhance or weaken with the increase of the Bi2Te3 thickness beyond 1 quintuple layer (QL). The observation of the topological surface states crossing Fermi energy in the Bi2Te3/FeTe heterostructure with the average Bi2Te3 thickness of about 20 QL provides further evidence that this heterostructure may potentially host Majorana zero modes.