论文标题
通过诱导的自旋轨道耦合，石墨烯中稳定石墨烯中波动的自旋三重超导性
Stabilizing fluctuating spin-triplet superconductivity in graphene via induced spin-orbit coupling
论文作者
论文摘要
最近的一个实验表明，接近诱导的自旋轨道耦合增强了Bernal双层石墨烯中的自旋三链超导性。在这里，我们表明，由于石墨烯的几乎完美的自旋旋转对称性，三胞胎顺序参数的旋转方向的波动抑制了超导过渡到几乎零温度。我们的分析表明，这两种旋转轨道耦合和平面磁场都可以消除这些低洼的波动，并且可以极大地提高过渡温度，这与最近的实验一致。我们的模型还表明，在小各向异性和磁场上可能存在一个相位，该磁场表现出准长范围有序的自旋平线电荷4E超导性，即使三胞胎2E超导顺序仅表现出短距离相关性。最后，我们讨论相关的实验签名。
A recent experiment showed that 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 Ising spin-orbit coupling and 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 quasi-long-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.
