Evidence for two-dimensional Ising superconductivity in gated MoS 2
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- 11 December 2015
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 350 (6266), 1353-1357
- https://doi.org/10.1126/science.aab2277
Abstract
The Zeeman effect, which is usually detrimental to superconductivity, can be strongly protective when an effective Zeeman field from intrinsic spin-orbit coupling locks the spins of Cooper pairs in a direction orthogonal to an external magnetic field. We performed magnetotransport experiments with ionic-gated molybdenum disulfide transistors, in which gating prepared individual superconducting states with different carrier dopings, and measured an in-plane critical field Bc2 far beyond the Pauli paramagnetic limit, consistent with Zeeman-protected superconductivity. The gating-enhanced Bc2 is more than an order of magnitude larger than it is in the bulk superconducting phases, where the effective Zeeman field is weakened by interlayer coupling. Our study provides experimental evidence of an Ising superconductor, in which spins of the pairing electrons are strongly pinned by an effective Zeeman field.Keywords
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Funding Information
- European Research Council (648855 Ig-QPD)
- Croucher Foundation (HKUST3/CRF/13G, 602813, 605512, 16303014)
- Foundation for Fundamental Research on Matter
- Netherlands Organization for Scientific Research
- Hong Kong Research Grants Council
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