期刊
NANO LETTERS
卷 17, 期 10, 页码 6125-6130出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b02707
关键词
Graphene; NbSe2; two-dimensional materials; heterostructure; Josephson junction
类别
资金
- National Research Foundation (NRF) through SRC Center
- POSTECH, Korea [2011-0030046]
- SRC Center for Quantum Coherence in Condensed Matter
- KAIST, Korea [2016R1A5A1008184]
A layered two-dimensional superconducting material 2H-NbSe2 is used to build a van der Waals heterostructure, where a proximity-coupled superconducting order can be induced in the interfacing materials. Vertically stacked NbSe2-graphene-NbSe2 is fabricated using van der Waals interlayer coupling, producing defect-free contacts with a high interfacial transparency. The atomically thin graphene layer allows the formation of a highly coherent proximity Josephson coupling between the two NbSe2 flakes. The temperature dependence of the junction critical current (I-c) reveals short and ballistic Josephson coupling characteristics that agree with theoretical prediction. The strong Josephson coupling is confirmed by a large junction critical current density of 1.6 x 10(4) A/cm(2), multiple Andreev reflections in the subgap structure of the differential conductance, and a magnetic-field modulation of Ic. This is the first demonstration of strongly proximity-coupled Josephson junctions with extremely clean interfaces in a dry-transfer-stacked van der Waals heterostructure.
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