Superconductivity in Single-Quintuple-Layer Bi<sub>2</sub>Te<sub>3</sub> Grown on Epitaxial FeTe.
basic_science · Level V
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- Record sourced from PubMed, PMID 32207627.
- Also identified by DOI 10.1021/acs.nanolett.9b05167.
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Abstract
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 (<i>T</i><sub>C</sub> ≈ 13 K) on the epitaxial FeTe surface, by van der Waals epitaxy of single-quintuple-layer topological insulator Bi<sub>2</sub>Te<sub>3</sub>. Our study suggests that the superconductivity in the Bi<sub>2</sub>Te<sub>3</sub>/FeTe heterostructure is generated at the interface and that the superconductivity at the interface does not enhance or weaken with the increase of the Bi<sub>2</sub>Te<sub>3</sub> thickness beyond 1 quintuple layer (QL). The observation of the topological surface states crossing Fermi energy in the Bi<sub>2</sub>Te<sub>3</sub>/FeTe heterostructure with the average Bi<sub>2</sub>Te<sub>3</sub> thickness of about 20 QL provides further evidence that this heterostructure may potentially host Majorana zero modes.