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タイトル: | Extended quantum dimer model and novel valence-bond phases |
著者: | Nakata, Kouki Totsuka, Keisuke |
著者名の別形: | 仲田, 光樹 |
キーワード: | dimers (theory) phase diagrams (theory) quantum phase transitions (theory) |
発行日: | Jan-2011 |
出版者: | IOP Publishing Ltd and SISSA |
誌名: | Journal of Statistical Mechanics: Theory and Experiment |
巻: | 2011 |
号: | 01 |
論文番号: | P01033 |
抄録: | We extend the quantum dimer model (QDM) introduced by Rokhsar and Kivelson so as to construct a concrete example of the model which exhibits the first-order phase transition between different valence-bond solids suggested recently by Batista and Trugman and look for the possibility of other exotic dimer states. We show that our model contains three exotic valence-bond phases (herringbone, checkerboard and dimer smectic) in the ground-state phase diagram and that it realizes the phase transition from the staggered valence-bond solid to the herringbone. The checkerboard phase has four-fold rotational symmetry, while the dimer smectic, in the absence of quantum fluctuations, has massive degeneracy originating from partial ordering only in one of the two spatial directions. A resonance process involving three dimers resolves this massive degeneracy and the dimer smectic becomes ordered (order from disorder). |
著作権等: | © IOP Publishing 2011 This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/138090 |
DOI(出版社版): | 10.1088/1742-5468/2011/01/P01033 |
出現コレクション: | 学術雑誌掲載論文等 |
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