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Park, Sun Gyu
원자제어 저차원 전자계 연구단
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Josephson effect of the superconducting van der waals junction

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Title
Josephson effect of the superconducting van der waals junction
Author(s)
Sungyu Park; Chang Il Kwon; CALDES
Publication Date
2021-06-01
Journal
Progress in Superconductivity and Cryogenics (PSAC), v.23, no.2, pp.6 - 9
Publisher
Korea Institute of Applied Superconductivity and Cryogenics
Abstract
© 2021, Korea Institute of Applied Superconductivity and Cryogenics. All rights reserved.Heterostructures fabricated by various combinations of van der Waals (vdW) materials enable us to investigate disorder-free physical properties and realize novel functional devices. Superconducting vdW junctions have attracted a lot of attention because of its simple structure without a barrier layer. In superconducting vdW junction, without extra fabrication effort, a natural barrier can be formed, whose character is sensitive to distance and angle of lattice between two superconducting vdW materials. Using high-quality single crystals and the dry transfer technique, we fabricated the vertically stacked NbSe2/NbSe2 and FeSe/FeSe vdW junctions and investigated their Josephson junction properties. We found that in the FeSe junctions, Josephson coupling is extremely sensitive to the fabrication conditions, in contrast to the NbSe2 junctions. We attributed this distinct character of the FeSe junctions to surface instability and small Fermi surface of FeSe.
URI
https://pr.ibs.re.kr/handle/8788114/10371
DOI
10.9714/psac.2021.23.2.006
ISSN
1229-3008
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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