- Award ID(s):
- 1641101
- NSF-PAR ID:
- 10182257
- Date Published:
- Journal Name:
- npj Quantum Materials
- Volume:
- 5
- Issue:
- 1
- ISSN:
- 2397-4648
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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Abstract The interplay between charge transfer and electronic disorder in transition-metal dichalcogenide multilayers gives rise to superconductive coupling driven by proximity enhancement, tunneling and superconducting fluctuations, of a yet unwieldy variety. Artificial spacer layers introduced with atomic precision change the density of states by charge transfer. Here, we tune the superconductive coupling between
monolayers from proximity-enhanced to tunneling-dominated. We correlate normal and superconducting properties in tailored multilayers with varying SnSe layer thickness ( ). From high-field magnetotransport the critical fields yield Ginzburg–Landau coherence lengths with an increase of cross-plane ( ), trending towards two-dimensional superconductivity for . We show cross-overs between three regimes: metallic with proximity-enhanced coupling ( ), disordered-metallic with intermediate coupling ( ) and insulating with Josephson tunneling ( ). Our results demonstrate that stacking metal mono- and dichalcogenides allows to convert a metal/superconductor into an insulator/superconductor system, prospecting the control of two-dimensional superconductivity in embedded layers.