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arXiv 1002.4593cond-mat.dis-nncond-mat.str-el
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具有量子自旋玻璃基态的AKLT模型

AKLT Models with Quantum Spin Glass Ground States

C. R. Laumann, S. A. Parameswaran, S. L. Sondhi, F. Zamponi

摘要:

我们研究了AKLT模型的局部树型晶格的固定连接,并发现它们表现出各种基态取决于自旋,协调和全球(图)拓扑结构。我们发现a)量子顺磁或价键固体基态,b)临界和有序的Néel状态的二分无限凯莱树和c)临界和有序的量子矢量自旋玻璃状态的随机图的固定连接。我们认为,在与以前的分析一致,所有阶段的特点是当地的激励差距。我们报道的自旋玻璃态是由随机长程循环引起的,尽管耦合强度缺乏随机性,但长程循环破坏了Néel有序。

英文摘要:

We study AKLT models on locally tree-like lattices of fixed connectivity and find that they exhibit a variety of ground states depending upon the spin, coordination and global (graph) topology. We find a) quantum paramagnetic or valence bond solid ground states, b) critical and ordered Néel states on bipartite infinite Cayley trees and c) critical and ordered quantum vector spin glass states on random graphs of fixed connectivity. We argue, in consonance with a previous analysis, that all phases are characterized by gaps to local excitations. The spin glass states we report arise from random long ranged loops which frustrate Néel ordering despite the lack of randomness in the coupling strengths.

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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