期刊
NATURE COMMUNICATIONS
卷 9, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-03000-w
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资金
- Israeli-French High Council for Scientific & Technological Research
- ANR JCJC grant (SPINOES) from the French Agence Nationale de Recherche
- ERC-STG [637298]
- Marie Curie CIG Grant [PCIG12-GA-2012-333620]
- Azrieli Foundation
- European Union's Horizon research and innovation programme under the Marie Skodowska-Curie Grant [659247]
- Israeli Science Foundation [1287/15]
- Marie Curie Actions (MSCA) [659247] Funding Source: Marie Curie Actions (MSCA)
Tunnel junctions, an established platform for high resolution spectroscopy of superconductors, require defect-free insulating barriers; however, oxides, the most common barrier, can only grow on a limited selection of materials. We show that van der Waals tunnel barriers, fabricated by exfoliation and transfer of layered semiconductors, sustain stable currents with strong suppression of sub-gap tunneling. This allows us to measure the spectra ;of bulk (20 nm) and ultrathin (3- and 4-layer) NbSe2 devices at 70 mK. These exhibit two distinct superconducting gaps, the larger of which decreases monotonically with thickness and critical temperature. The spectra are analyzed using a two-band model incorporating depairing. In the bulk, the smaller gap exhibits strong depairing in in-plane magnetic fields, consistent with high out-of-plane Fermi velocity. In the few-layer devices, the large gap exhibits negligible depairing, consistent with out-of-plane spin locking due to Ising spin-orbit coupling. In the 3-layer device, the large gap persists beyond the Pauli limit.
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