Two-dimensional superconductivity at the interface of a Bi2Te3/FeTe heterostructure

Qing Lin He, Hongchao Liu, Mingquan He, Ying Hoi Lai, Hongtao He, Gan Wang, Kam Tuen Law, Rolf Lortz, Jiannong Wang and Iam Keong Sou ()
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Qing Lin He: William Mong Institute of Nano Science and Technology, the Hong Kong University of Science and Technology
Hongchao Liu: the Hong Kong University of Science and Technology
Mingquan He: William Mong Institute of Nano Science and Technology, the Hong Kong University of Science and Technology
Ying Hoi Lai: William Mong Institute of Nano Science and Technology, the Hong Kong University of Science and Technology
Hongtao He: the Hong Kong University of Science and Technology
Gan Wang: South University of Science and Technology of China
Kam Tuen Law: the Hong Kong University of Science and Technology
Rolf Lortz: William Mong Institute of Nano Science and Technology, the Hong Kong University of Science and Technology
Jiannong Wang: William Mong Institute of Nano Science and Technology, the Hong Kong University of Science and Technology
Iam Keong Sou: William Mong Institute of Nano Science and Technology, the Hong Kong University of Science and Technology

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract The realization of superconductivity at the interface between a topological insulator and an iron-chalcogenide compound is highly attractive for exploring several recent theoretical predictions involving these two new classes of materials. Here we report transport measurements on a Bi2Te3/FeTe heterostructure fabricated via van der Waals epitaxy, which demonstrate superconductivity at the interface, which is induced by the Bi2Te3 epilayer with thickness even down to one quintuple layer, though there is no clear-cut evidence that the observed superconductivity is induced by the topological surface states. The two-dimensional nature of the observed superconductivity with the highest transition temperature around 12 K was verified by the existence of a Berezinsky–Kosterlitz–Thouless transition and the diverging ratio of in-plane to out-plane upper critical field on approaching the superconducting transition temperature. With the combination of interface superconductivity and Dirac surface states of Bi2Te3, the heterostructure studied in this work provides a novel platform for realizing Majorana fermions.

Date: 2014
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DOI: 10.1038/ncomms5247

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