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arXiv 1208.4306cond-mat.str-el
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利用纠缠重整化研究自旋1/2空间各向异性三角形反铁磁体螺旋态的不可逆性

Numerical study of incommensurability of the spiral state on spin-1/2 spatially anisotropic triangular antiferromagnets using entanglement renormalization

Kenji Harada

摘要:

对空间各向异性三角晶格上S=1/2反铁磁海森堡模型的基态进行了数值研究,该模型是有机电荷转移盐(Cs2 CuCl 4)三角层上莫特绝缘体的有效模型.我们采用数值变分方法,利用纠缠重整化的张量网络,提高了对量子态的描述能力。在热力学极限下,当J1和J2分别表示链内和链间的耦合常数时,磁基态为0.7 <= J2/J1 <= 1.除了各向同性的情况下(J1=J2),磁结构是螺旋与非公度波矢量,这是不同于经典的。量子涨落削弱了链间的有效耦合,但磁序仍保持在热力学极限。此外,无公度波数与级数展开法的结果也符合得很好。

英文摘要:

The ground state of an S=1/2 antiferromagnetic Heisenberg model on a spatially anisotropic triangular lattice, which is an effective model of Mott insulators on a triangular layer of organic charge transfer salts or Cs2CuCl4, is numerically studied. We apply a numerical variational method by using a tensor network with entanglement renormalization, which improves the capability of describing a quantum state. Magnetic ground states are identified for 0.7 <= J2/J1 <= 1 in the thermodynamic limit, where J1 and J2 denote the inner-chain and inter-chain coupling constants, respectively. Except for the isotropic case (J1=J2), the magnetic structure is spiral with an incommensurate wave vector that is different from the classical one. The quantum fluctuation weakens the effective coupling between chains, but the magnetic order remains in the thermodynamic limit. In addition, the incommensurate wave number is in good agreement with that of the series expansion method.

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