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Bi2Te3/Fe1+yTe heterostructures are known to exhibit interfacialsuperconductivity between two non-superconducting materials: Fe1+yTe as theparent compound of Fe-based superconducting materials and the topologicalinsulator Bi2Te3. Here, we present a top-down approach starting fromtwo-dimensional (2D) heterostructures to fabricate one-dimensional (1D)Bi2Te3/Fe1+yTe nanowires or narrow nanoribbons. We demonstrate that theBi2Te3/Fe1+yTe heterostructure remains intact in nanostructures of widths onthe order of 100 nm and the interfacial superconductivity is preserved, asevidenced by electrical transport and Andreev reflection point contactspectroscopy experiments measured at the end of the nanowire. The differentialconductance shows a similar superconducting twin-gap structure as intwo-dimensional heterostructures, but with enhanced fluctuation effects due tothe lower dimensionality. A zero-bias conductance peak indicates the presenceof an Andreev bound state and given the involvement of the topological Bi2Te3surface state, we discuss a possible topological nature of superconductivitywith strong interplay with an emerging ferromagnetism due to the interstitialexcess iron in the Fe1+yTe layer, developing in parallel with superconductivityat low temperatures.

Interfacial superconductivity and zero bias peak in quasi-one-dimensional Bi2Te3/Fe1+yTe heterostructure nanostructures