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DOE OSTI · 2424078

Stabilizing Fluctuating Spin-Triplet Superconductivity in Graphene via Induced Spin-Orbit Coupling

Curtis, Jonathan B.·Poniatowski, Nicholas R.·Xie, Yonglong·Yacoby, Amir·Demler, Eugene·Narang, Prineha
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Abstract

A recent experiment showed that a proximity-induced Ising spin-orbit coupling enhances the spin-triplet superconductivity in Bernal bilayer graphene. Here, in this work, we show that, due to the nearly perfect spin rotation symmetry of graphene, the fluctuations of the spin orientation of the triplet order parameter suppress the superconducting transition to nearly zero temperature. Our analysis shows that both an Ising spin-orbit coupling and an in-plane magnetic field can eliminate these low-lying fluctuations and can greatly enhance the transition temperature, consistent with the recent experiment. Our model also suggests the possible existence of a phase at small anisotropy and magnetic field which exhibits quasilong-range ordered spin-singlet charge 4⁢e superconductivity, even while the triplet 2⁢e superconducting order only exhibits short-ranged correlations. Finally, we discuss relevant experimental signatures.

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75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITYbilayer graphenegraphenespin-orbit couplingspin-triplet pairingsuperconducting fluctuations

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Curtis, Jonathan B., Poniatowski, Nicholas R., Xie, Yonglong, Yacoby, Amir, Demler, Eugene, Narang, Prineha. 2023-05-09. Stabilizing Fluctuating Spin-Triplet Superconductivity in Graphene via Induced Spin-Orbit Coupling. https://doi.org/10.1103/physrevlett.130.196001

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