Journal
SCIENCE
Volume 324, Issue 5932, Pages 1314-1317Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1170775
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Funding
- NSF [DMR-0606485]
- Welch Foundation
- Texas Advanced Research Program
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0906025] Funding Source: National Science Foundation
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Superconductivity in the extreme two-dimensional limit is studied on ultrathin lead films down to two atomic layers, where only a single channel of quantum well states exists. Scanning tunneling spectroscopy reveals that local superconducting order remains robust until two atomic layers, where the transition temperature abruptly plunges to a lower value, depending sensitively on the exact atomic structure of the film. Our result shows that Cooper pairs can still form in the last two-dimensional channel of electron states, although their binding is strongly affected by the substrate.
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