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arXiv 1010.3098cond-mat.str-el
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平面反铁磁J_1-J_2-J_3海森堡模型的量子相位

Quantum Phases of the Planar Antiferromagnetic J_1-J_2-J_3 Heisenberg-Model

Johannes Reuther, Peter Wölfle, Rachid Darradi, Wolfram Brenig, Marcelo Arlego, Johannes Richter

摘要:

本文给出了平面阻挫J_1-J_2-J_3自旋1/2量子反铁磁体的补充分析结果。利用动力学泛函重整化群、高阶耦合团簇计算和基于流方程的级数展开方法,计算了广义动量分辨磁化率、基态能量、磁序参量和元激发能隙.由此我们确定了一个量子相图,它显示了一个位于Neel态、螺旋态和共线态之间的量子顺磁相的大窗口,这些状态已经存在于经典的J_1-J_2-J_3反铁磁体中。我们的研究结果是一致的大量元格相关的量子顺磁相。量子顺磁区的范围被发现是在令人满意的协议之间的三种不同的方法,我们已经采用。

英文摘要:

We present results of a complementary analysis of the frustrated planar J_1-J_2-J_3 spin-1/2 quantum-antiferromagnet. Using dynamical functional renormalization group, high-order coupled cluster calculations, and series expansion based on the flow equation method, we have calculated generalized momentum resolved susceptibilities, the ground state energy, the magnetic order parameter, and the elementary excitation gap. From these we determine a quantum phase diagram which shows a large window of a quantum paramagnetic phase situated between the Neel, spiral and collinear states, which are present already in the classical J_1-J_2-J_3 antiferromagnet. Our findings are consistent with substantial plaquette correlations in the quantum paramagnetic phase. The extent of the quantum paramagnetic region is found to be in satisfying agreement between the three different approaches we have employed.

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