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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 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.