论文标题
ute $ _2 $中的手性超导性通过新兴$ C_4 $对称和旋转轨道耦合
Chiral Superconductivity in UTe$_2$ via Emergent $C_4$ Symmetry and Spin Orbit Coupling
论文作者
论文摘要
在UTE $ _2 $中引起了很多关注，并提出了时间反转对称性的三胞胎手性超导订单参数。订单参数的手性归因于两个超导型组件的偶然接近堕落，属于1d irreps $ b_ {2u} $和$ b_ {3u} $的相关$ d_ {2h} $ copt $ copt组的$ b_ {3U} $，并被认为是由chiral $ b_}选择的组合铁磁波动。 In this work we present a possible explanation of the near-degeneracy as a result of an accidental $C_4$ symmetry of the band structure, with the superconducting order parameter belonging the 2D $E_u$ irrep of $D_{4h}$ that uniquely descends to the sought after $B_{2u}+iB_{3u}$ combination.我们表明，$ C_4 $对称性在相互作用的水平上使用重新归一化组计算出现，并认为当将旋转轨道耦合添加到模型中时，订单参数的手性组合受到青睐。
A lot of attention has been drawn to superconductivity in UTe$_2$, with suggestions of time-reversal symmetry breaking triplet chiral superconducting order parameter. The chirality of the order parameter has been attributed to an accidental near degeneracy of two superconducting components belonging to 1D irreps $B_{2u}$ and $B_{3u}$ of the relevant $D_{2h}$ point group, and it has been argued that the chiral $B_{2u}+iB_{3u}$ combination is selected by ferromagnetic fluctuations. In this work we present a possible explanation of the near-degeneracy as a result of an accidental $C_4$ symmetry of the band structure, with the superconducting order parameter belonging the 2D $E_u$ irrep of $D_{4h}$ that uniquely descends to the sought after $B_{2u}+iB_{3u}$ combination. We show that the $C_4$ symmetry is emergent at the level of the interactions using a renormalization group calculation and argue that the chiral combination of the order parameter is favored when spin-orbit coupling is added to the model.
