论文标题
掺杂的三角晶格费米 - 哈伯德模型中的手性超导性
Chiral superconductivity in the doped triangular-lattice Fermi-Hubbard model in two dimensions
论文作者
论文摘要
由于其与手性自旋状态和非常规的超导性有关，因此在文献中已广泛研究了三角晶格费米 - 哈伯德模型。以前对掺杂系统基态的模拟依赖于禁止真正的长距离顺序的准二维晶格。在这里，我们使用最先进的辅助场量子蒙特卡洛（Monte Carlo）模拟了二维和准二维三角形晶格。在掺杂非磁性手性旋转状态后，我们观察到手性超导性的证据，并由库珀对相关中的远距离顺序支持和手性顺序参数的有限值。以此目的，我们首先定位从金属到非磁性绝缘阶段的过渡和磁顺序的开始。我们的结果铺平了对具有磁性挫败感的强相关晶格系统的更好理解的道路。
The triangular-lattice Fermi-Hubbard model has been extensively investigated in the literature due to its connection to chiral spin states and unconventional superconductivity. Previous simulations of the ground state of the doped system rely on quasi-one-dimensional lattices where true long-range order is forbidden. Here we simulate two-dimensional and quasi-one-dimensional triangular lattices using state-of-the-art Auxiliary-Field Quantum Monte Carlo. Upon doping a non-magnetic chiral spin state, we observe evidence of chiral superconductivity supported by long-range order in Cooper-pair correlation and a finite value of the chiral order parameter. With this aim, we first locate the transition from the metallic to the non-magnetic insulating phase and the onset of magnetic order. Our results pave the way towards a better understanding of strongly correlated lattice systems with magnetic frustration.
