立方狄拉克带中同位旋极化态附近的超导电性
Superconductivity in the vicinity of an isospin-polarized state in a cubic Dirac band
摘要：
我们提出了一个理论的超导配对起源于软临界涨落附近的同位旋极化状态的菱形三层石墨烯。使用基于量子力学的方法，我们确定了可能的同位旋序类型，并推导出了由同位旋涨落介导的有效电子-电子相互作用。由于这些相互作用而产生的超导性具有对称性和序参量结构，它们以独特的方式依赖于“母”同位旋序。该模型自然地导致邻近于同位旋有序相变的超导相，其模仿了实验中观察到的行为。在实验中推断的同位旋序类型预测的成对状态的对称性与观测结果相匹配。这些发现支持了一种源于电子-电子相互作用的超导性的设想。
英文摘要：
We present a theory of superconducting pairing originating from soft critical fluctuations near isospin-polarized states in rhombohedral trilayer graphene. Using a symmetry-based approach, we determine possible isospin order types and derive the effective electron-electron interactions mediated by isospin fluctuations. Superconductitivty arising due to these interactions has symmetry and order parameter structure that depend in a unique way on the "mother" isospin order. This model naturally leads to a superconducting phase adjacent to isospin-ordering phase transition, which mimics the behavior observed in experiment. The symmetry of the paired state predicted for the isospin order type inferred in experiments matches the observations. These findings support a scenario of superconductivity originating from electron-electron interactions.
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