Bernal堆叠双层石墨烯中源于排斥相互作用的超导性
Superconductivity from repulsive interactions in Bernal-stacked bilayer graphene
AI总结：
本文通过功能重正化群和随机相近似计算，提出Bernal堆叠双层石墨烯中由磁场或Ising自旋-轨道耦合增强的纯电子p波不稳定性，统一解释了其超导机制。
摘要：
一系列引人注目的实验在通过施加电位移场使能带平坦化时，在Bernal堆叠双层石墨烯（BBG）中观察到了超导性。有趣的是，超导性仅在非零磁场下，或当通过耦合衬底在BBG中诱导出自旋-轨道耦合时才会显现。我们提出了详细的功能重正化群和随机相近似计算，为这两种情况下的超导机制提供了统一的解释。两种计算均得出Kohn-Luttinger（KL）型的纯电子p波不稳定性。后者可以通过磁场或Ising自旋-轨道耦合增强，自然地解释了实验中观察到的行为。
英文摘要：
A striking series of experiments have observed superconductivity in Bernal-stacked bilayer graphene (BBG) when the energy bands are flattened by applying an electrical displacement field. Intriguingly, superconductivity manifests only at non-zero magnetic fields, or when spin-orbit coupling is induced in BBG by coupling to a substrate. We present detailed functional renormalization group and random-phase approximation calculations that provide a unified explanation for the superconducting mechanism in both cases. Both calculations yield a purely electronic $p$-wave instability of the Kohn-Luttinger (KL) type. The latter can be enhanced either by magnetic fields or Ising spin-orbit coupling, naturally explaining the behaviour seen in experiments.
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