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arXiv 0907.1710cond-mat.str-elcond-mat.supr-con
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三角晶格上的弱莫特绝缘体:无隙自旋量子自旋液体的可能性

Weak Mott insulators on the triangular lattice: possibility of a gapless nematic quantum spin liquid

Tarun Grover, N. Trivedi, T. Senthil, Patrick A. Lee

摘要:

利用变分Monte Carlo方法研究了具有四粒子环交换的三角晶格反铁磁体不同对称性的Gutzwiller投影BCS态的能量。在一定的参数范围内,发现能量上有利的状态是一个破坏晶格旋转对称性的投影$d_{x^2-y^2}$配对态。我们表明,这种取向有序的成对自旋液体状态作为温度和压力的函数的属性可以解释许多有机材料的实验。我们还研究了具有铁磁海森堡交换的环交换模型,发现在所研究的ansätze中,投影$f-$波态是最有利的。

英文摘要:

We study the energetics of Gutzwiller projected BCS states of various symmetries for the triangular lattice antiferromagnet with a four particle ring exchange using variational Monte Carlo methods. In a range of parameters the energetically favored state is found to be a projected $d_{x^2-y^2}$ paired state which breaks lattice rotational symmetry. We show that the properties of this nematic or orientationally ordered paired spin liquid state as a function of temperature and pressure can account for many of the experiments on organic materials. We also study the ring-exchange model with ferromagnetic Heisenberg exchange and find that amongst the studied ansätze, a projected $f-$wave state is the most favorable.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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