Variational study on the cluster glass wave function for the 2D extended t – J model

By using the variational Monte Carlo approach, we have demonstrated the existence of cluster glass states with a randomly-distributed short-ranged modulations is a natural outcome of the extended t – J models. As shown in our recent paper [1], these glassy states have almost the same energy as the u...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 150; no. 5; p. 052137
Main Authors Chou, Chung-Pin, Fukushima, Noboru, Lee, Ting-Kuo
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.03.2009
Subjects
Clusters
Mathematical models
Order parameters
Physics
Two dimensional models
Wave functions
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Summary:By using the variational Monte Carlo approach, we have demonstrated the existence of cluster glass states with a randomly-distributed short-ranged modulations is a natural outcome of the extended t – J models. As shown in our recent paper [1], these glassy states have almost the same energy as the uniform superconducting ground state if the modulation is moderate. Also we show that there are many possible degenerate states within a wide range of variational parameters. Because of the unusual degeneracy in the extended t – J models, random distribution of any defect or impurity in the materials could easily stabilize the glassy state. All these results obtained without introducing extra competing interactions or new order parameters seem to provide an appropriate framework to understand the experiments.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/150/5/052137