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arXiv 0707.0629cond-mat.str-el
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彭罗斯量子反铁磁体

Penrose Quantum Antiferromagnet

Anuradha Jagannathan, Attila Szallas, Stefan Wessel, Michel Duneau

摘要:

彭罗斯镶嵌是一个完美有序的二维结构,具有五重对称性和在站点抽取下的尺度不变性。在这样的系统上的量子自旋模型,由于其特殊的对称性,可以预期与更传统的结构有很大的不同。例如,在一个维度上,非周期性可以导致独特的量子纠缠特性。在本工作中,我们研究了自旋为1/2的海森堡反铁磁体在彭罗斯镶嵌上的基态性质,这个模型也适用于某些三维反铁磁准晶。我们表明,使用自旋波理论和量子蒙特卡罗模拟,当地交错磁化强烈依赖于当地的协调数z和最小化的一些网站上的五重对称。我们提出了一个简单的解释,这种行为的海森堡恒星。最后,我们展示了如何最好地代表这个复杂的非均匀基态,使用“垂直空间”表示的平铺。

英文摘要:

The Penrose tiling is a perfectly ordered two dimensional structure with fivefold symmetry and scale invariance under site decimation. Quantum spin models on such a system can be expected to differ significantly from more conventional structures as a result of its special symmetries. In one dimension, for example, aperiodicity can result in distinctive quantum entanglement properties. In this work, we study ground state properties of the spin-1/2 Heisenberg antiferromagnet on the Penrose tiling, a model that could also be pertinent for certain three dimensional antiferromagnetic quasicrystals. We show, using spin wave theory and quantum Monte Carlo simulation, that the local staggered magnetizations strongly depend on the local coordination number z and are minimized on some sites of five-fold symmetry. We present a simple explanation for this behavior in terms of Heisenberg stars. Finally we show how best to represent this complex inhomogeneous ground state, using the "perpendicular space" representation of the tiling.

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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