论文标题
掺杂三角形莫特绝缘子的超导性：母体自旋背景和电荷动能的作用
Superconductivity in doped triangular Mott insulators: the roles of parent spin backgrounds and charge kinetic energy
论文作者
论文摘要
我们通过考虑三个不同的父母旋转背景，即$ 120^{\ circ} $ antiferromagnets，量子旋转液体，量子旋转液体和脱衣舞素的抗fiferromagnets，以及所有可能的标志组合$（tripe and-tripe nightigh-n-n-n-n-n-Ongerighter，and-tripter-neigh-neiring-neigrighter，and-comparter $ nigh-combanter，and-flotegranter，$ neightirger，我们将研究掺杂的三角形莫特绝缘子，研究掺杂三角形的莫特绝缘子的超导性的先决条件。跳$（T_1，T_2）$。基于密度 - 矩阵的重新归一化组计算，我们发现，使用有限的$ t_2 $和特定的符号组合$（τ_1，τ_2）$，无论父母旋转背景的性质如何，都可以始终达到准较长的范围超导率。除了特定的跳符号$（τ_1，τ_2）$之外，这些三角形晶格中的这些超导阶段通常以短态旋转相关性和每条条带的两个电荷为特征。在以较大$ t_2/t_1 $实现的强大超导阶段中，翻转符号$τ_2$和$τ_1$的符号分别在没有强大的配对和PseudoGap样阶段的情况下会增加条纹阶段，而没有Cooper-Pair阶段相干性。有趣的是，两个跳跃标志的角色以较小的$ t_2/t_1 $切换。此外，不同的符号组合$（τ_1，τ_2）$将稳定不同的相位，包括超导性，电荷密度波，旋转密度波和伪造的类似相似的相。我们的发现表明，电荷动能在实现掺杂的三角晶格莫特绝缘子中的超导性中的重要作用。
We study the prerequisites for realizing superconductivity in doped triangular-lattice Mott insulators by considering three distinct parent spin backgrounds, i.e., $120^{\circ}$ antiferromagnets, quantum spin liquid, and stripy antiferromagnets, and all possible sign combinations $(τ_1, τ_2)$ of nearest-neighbor hopping and next-nearest-neighbor hopping $(t_1, t_2)$. Based on density-matrix renormalization group calculations, we find that, with finite $t_2$ and specific sign combinations $(τ_1, τ_2)$, the quasi-long-range superconductivity order can always be achieved, regardless of the nature of the parent spin backgrounds. Besides specific hopping signs $(τ_1, τ_2)$, these superconductivity phases in triangular lattices are commonly characterized by short-ranged spin correlations and two charges per stripe. In the robust superconductivity phase realized at larger $t_2/t_1$, flipping the signs $τ_2$ and $τ_1$ gives rise to the stripe phase without strong pairing and pseudogap-like phase without Cooper-pair phase coherence, respectively. Interestingly, the roles of the two hopping signs are switched at smaller $t_2/t_1$. Moreover, different sign combinations $(τ_1, τ_2)$ would stabilize distinct phases including superconductivity, charge density waves, spin density waves, and pseudogap-like phases accordingly. Our findings suggest the important role of charge kinetic energy in realizing superconductivity in doped triangular-lattice Mott insulators.
