论文标题
IPEPS在掺杂的$ t $ -j $模型中的自旋对称性研究
iPEPS study of spin symmetry in the doped $t$-$J$ model
论文作者
论文摘要
我们使用无限投影纠缠对状态（IPEPS）研究了一个方格上的二维$ t $ - $ j $型号。在小掺杂时，多个秩序，例如抗铁磁秩序，条纹顺序和超导顺序，相互交织或相互竞争。我们通过在IPEPS ANSATZ中施加SU（2）自旋对称性（2）或其U（1）亚组在小掺杂中的作用，从而在热力学极限中分别排除或允许自发自旋对称性破坏。从我们的模拟的详细比较中，我们提供了证据表明条纹顺序是由远程防铁磁性顺序钉住的。我们还发现，执行旋转态状态的SU（2）IPEP会产生均匀的电荷分布，并有利于D-Wave Singlet配对。
We study the two-dimensional $t$-$J$ model on a square lattice using infinite projected entangled pair states (iPEPS). At small doping, multiple orders, such as antiferromagnetic order, stripe order and superconducting order, are intertwined or compete with each other. We demonstrate the role of spin symmetry at small doping by either imposing SU(2) spin symmetry or its U(1) subgroup in the iPEPS ansatz, thereby excluding or allowing spontaneous spin-symmetry breaking respectively in the thermodynamic limit. From a detailed comparison of our simulations, we provide evidence that stripe order is pinned by long-range antiferromagnetic order. We also find that SU(2) iPEPS, which enforces a spin-singlet state, yields a uniform charge distribution and favors d-wave singlet pairing.
