Strong Proximity Josephson Coupling in Vertically Stacked NbSe2 - Graphene-NbSe2 van der Waals Junctions
SCIE
SCOPUS
- Title
- Strong Proximity Josephson Coupling in Vertically Stacked NbSe2 - Graphene-NbSe2 van der Waals Junctions
- Authors
- Kim, Minsoo; Park, Geon-Hyoung; Lee, Jongyun; Lee, Jae Hyeong; Park, Jinho; LEE, HYUN WOO; Lee, Gil-Ho; Lee, Hu-Jong
- Date Issued
- 2017-10
- Publisher
- AMER CHEMICAL SOC
- Abstract
- 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.
- Keywords
- ENERGY-GAP; SUPERCONDUCTIVITY; CONTACT; HETEROSTRUCTURES; SUPERLATTICES; TRANSITION; INTERFACES; LAYERS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/50495
- DOI
- 10.1021/acs.nanolett.7b02707
- ISSN
- 1530-6984
- Article Type
- Article
- Citation
- NANO LETTERS, vol. 17, no. 10, page. 6125 - 6130, 2017-10
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