Theory of a competitive spin liquid state for weak Mott insulators on the triangular lattice.
Theory of a competitive spin liquid state for weak Mott insulators on the triangular lattice.
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DOI：
10.1103/physrevlett.111.157203
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发表时间：
2013-07
影响因子：
8.6
通讯作者：
R. Mishmash;J. Garrison;S. Bieri;Cenke Xu
中科院分区：
文献类型：
--
作者：
R. Mishmash;J. Garrison;S. Bieri;Cenke Xu
我们提出了一种新型的量子自旋液态，它可以解释有机自旋液态候选材料 κ-(BEDT-TTF)2Cu2(CN)3 和 EtMe3Sb[Pd(dmit)2]2 的低温相的许多有趣的实验性质。这种成对的费米子自旋子状态保留了系统的所有对称性，并且它具有无间隙激发光谱，其二次能带在动量 k[over →]=0 处接触。这种二次能带接触受到对称性的保护。使用变分蒙特卡罗技术，我们表明该状态在三角晶格海森堡模型中具有高度竞争的能量，并辅以实际大的环交换项。
We propose a novel quantum spin liquid state that can explain many of the intriguing experimental properties of the low-temperature phase of the organic spin liquid candidate materials κ-(BEDT-TTF)2Cu2(CN)3 and EtMe3Sb[Pd(dmit)2]2. This state of paired fermionic spinons preserves all symmetries of the system, and it has a gapless excitation spectrum with quadratic bands that touch at momentum k[over →]=0. This quadratic band touching is protected by symmetries. Using variational Monte Carlo techniques, we show that this state has highly competitive energy in the triangular lattice Heisenberg model supplemented with a realistically large ring-exchange term.