Evidence for two-dimensional Ising superconductivity in gated MoS2

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Science  12 Nov 2015:
DOI: 10.1126/science.aab2277

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The Zeeman effect, usually detrimental to superconductivity, can be strongly protective when an effective Zeeman field from intrinsic spin-orbit coupling locks the spins of Cooper pairs to a direction orthogonal to an external magnetic field. We perform magnetotransport experiments of ionic-gated MoS2 transistors, where gating prepares individual superconducting states with different carrier dopings, and measure 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 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.

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