凝聚态物理
超导电性
物理
自旋(空气动力学)
伊辛模型
双层石墨烯
联轴节(管道)
各向异性
自旋轨道相互作用
单重态
石墨烯
材料科学
量子力学
热力学
激发态
冶金
作者
Jonathan B. Curtis,Nicholas R. Poniatowski,Yonglong Xie,Amir Yacoby,Eugene Demler,Prineha Narang
标识
DOI:10.1103/physrevlett.130.196001
摘要
A recent experiment showed that a proximity-induced Ising spin-orbit coupling enhances the spin-triplet superconductivity in Bernal bilayer graphene. Here, 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 $4e$ superconductivity, even while the triplet $2e$ superconducting order only exhibits short-ranged correlations. Finally, we discuss relevant experimental signatures.
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