论文标题
与各向异性相互作用的掺杂哈伯德模型中的抗铁磁性和超导性之间的竞争
The competition between antiferromagnetism and superconductivity in a doped Hubbard model with anisotropic interaction
论文作者
论文摘要
抗铁磁性和超导性之间的竞争是强相关系统研究中的核心问题之一。在这项工作中，我们利用了一个包含哈伯德相互作用的双层模型和层间的海森贝格相互作用来揭示他们的竞争。该模型在某些条件下没有符号问题，我们执行投影仪量子蒙特卡洛模拟以提取磁性和超导性的基态相关性。我们的结果表明，当抗铁磁性被调整覆盖或各向异性的海森堡相互作用时，超导性就会出现。该模型可以看作是非常规超导体的类似物，可以帮助我们了解从抗铁磁绝缘子向超导体的过渡。
The competition between antiferromagnetism and superconductivity is one of the central questions in the research of strong correlated systems. In this work, we utilize a double layer model containing Hubbard interaction and interlayer Heisenberg interaction to reveal their competitions. This model is free of sign problem at certain conditions, and we perform projector quantum Monte Carlo simulations to extract the ground state correlations of magnetism and superconductivity. Our results shows that the superconductivity emerges when the antiferromagnetism is suppressed by tuning the filling or the anisotropy of the interlayer Heisenberg interaction. This model can be seen as an analogue of unconventional superconductors and may help us to understand the transition from an antiferromagnetic insulator to a superconductor.
