Chiral Spin Liquid Phase of the Triangular Lattice Hubbard Model: A Density Matrix Renormalization Group Study
Chiral Spin Liquid Phase of the Triangular Lattice Hubbard Model: A Density Matrix Renormalization Group Study
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DOI：
10.1103/physrevx.10.021042
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发表时间：
2018-08
影响因子：
12.5
通讯作者：
Aaron Szasz;J. Motruk;M. Zaletel;J. Moore
中科院分区：
文献类型：
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作者：
Aaron Szasz;J. Motruk;M. Zaletel;J. Moore
实验研究发现，其结构是很好地描述了由二维三角晶格的有机晶体中的量子自旋液相的签名的动机，我们研究了在半填充使用无限系统密度矩阵重整化群（iDMRG）方法在这个晶格上的哈伯德模型。在有限周长的无限圆柱体上，我们确定了在低相互作用强度下观察到的金属行为和在强相互作用下的Mott绝缘自旋有序行为之间的中间相。自发破缺的时间反转对称性，分数量子化自旋霍尔响应，和特征水平统计的纠缠谱中的中间阶段的手征订购提供了强有力的证据，手征自旋液体的存在，在全二维极限的模型。
Motivated by experimental studies that have found signatures of a quantum spin liquid phase in organic crystals whose structure is well described by the two-dimensional triangular lattice, we study the Hubbard model on this lattice at half filling using the infinite-system density matrix renormalization group (iDMRG) method. On infinite cylinders with finite circumference, we identify an intermediate phase between observed metallic behavior at low interaction strength and Mott insulating spin-ordered behavior at strong interactions. Chiral ordering from spontaneous breaking of time-reversal symmetry, a fractionally quantized spin Hall response, and characteristic level statistics in the entanglement spectrum in the intermediate phase provide strong evidence for the existence of a chiral spin liquid in the full two-dimensional limit of the model.