AI 中文总结
研究人员采用多变量变分蒙特卡洛方法，探究掺杂Kitaev量子自旋液体的超导电性，揭示不同Kitaev相互作用下超导配对对称性的变化规律，为实验搜寻非常规超导电性提供理论支撑。
AI 中文摘要
我们通过将多变量变分蒙特卡洛方法应用于空穴掺杂的t-J型Kitaev模型，研究掺杂Kitaev量子自旋液体中的超导电性。利用可精确描述Kitaev量子自旋液体的投影对积波函数，我们在各向同性二维团簇上检验超导相的稳定性。对于铁磁Kitaev相互作用，在低到中等掺杂区间，稳定的三重态p波超导电性与铁磁性共存，但当系统趋近完全极化铁磁相时，该超导电性被抑制。对于反铁磁Kitaev相互作用，超导体的主导配对对称性发生变化：低掺杂时为自旋依赖的三重态p波，中等掺杂时变为单重态d+id。在固定掺杂浓度下，通过改变铁磁Kitaev相互作用的强度，我们发现三重态超导电性随铁磁矩增强而提升，且在接近完全极化时达到最强。我们的结果为实验上在载流子掺杂的Kitaev候选材料中搜寻非常规超导电性（如与铁磁性共存的三重态超导电性）提供了理论依据。
英文摘要
We investigate superconductivity in a doped Kitaev quantum spin liquid by applying the many-variable variational Monte Carlo method to the hole-doped $t$-$J$-type Kitaev model. Using a projected pair-product wave function that can exactly represent the Kitaev quantum spin liquid, we examine the stability of superconducting phases on isotropic two-dimensional clusters. For the ferromagnetic Kitaev interaction, robust triplet $p$-wave superconductivity coexists with ferromagnetism in the low-to-intermediate doping regime but is suppressed as the system approaches the fully polarized ferromagnetic phase. For the antiferromagnetic Kitaev interaction, superconductivity exhibits a change in the dominant pairing symmetry from spin-dependent triplet $p$-wave at low doping to singlet $d+id$ at intermediate doping. By varying the strength of the ferromagnetic Kitaev interaction at fixed doping, we show that the triplet superconductivity increases together with the ferromagnetic moment and becomes strongest slightly below full polarization. Our results provide a theoretical basis for experimental searches for unconventional superconductivity, such as triplet superconductivity coexisting with ferromagnetism, in carrier-doped Kitaev candidate materials.
Comments14 pages, 7 figures, 1 table
