论文标题
UTE2中的磁性和超导性的周期性安德森模型
Periodic Anderson model for magnetism and superconductivity in UTe2
论文作者
论文摘要
我们提供并分析了一个周期性的Anderson模型，用于研究UTE $ _2 $中的磁性和超导性，这是最近发现的拓扑旋转三角体超导体的候选人。 24频段的紧密结合模型再现了从DFT $+U $计算获得的带状结构，该计算与角度分辨光发射光谱一致。 $ f $ - 电子的库仑相互作用增强了沿$ a $轴的iSing铁磁波动，并稳定了$ b_ {3u} $或$ a_ {u} $对称的旋转三键超导性。当考虑到积分的压力效应时，磁波动会变化对抗铁磁磁性，因此稳定了$ a_ {g} $对称性的自旋单链超导性。基于结果，我们提出了压力温度和磁场 - 温度相图，揭示了多个超导相以及抗磁性相。特别是，预测具有自发反向对称性破坏的混合元性超导状态。
We provide and analyze a periodic Anderson model for studying magnetism and superconductivity in UTe$_2$, a recently-discovered candidate for a topological spin-triplet superconductor. The 24-band tight-binding model reproduces the band structure obtained from a DFT$+U$ calculation consistent with an angle-resolved photoemission spectroscopy. The Coulomb interaction of $f$-electrons enhances Ising ferromagnetic fluctuation along the $a$-axis and stabilizes spin-triplet superconductivity of either $B_{3u}$ or $A_{u}$ symmetry. When effects of pressure are taken into account in hopping integrals, the magnetic fluctuation changes to antiferromagnetic one, and accordingly spin-singlet superconductivity of $A_{g}$ symmetry is stabilized. Based on the results, we propose pressure-temperature and magnetic field-temperature phase diagrams revealing multiple superconducting phases as well as an antiferromagnetic phase. In particular, a mixed-parity superconducting state with spontaneous inversion symmetry breaking is predicted.
