| Autor: |
Tetsuo Matsui, Ikuo Ichinose, Shunsuke Takashima, Kazuhiko Sakakibara, Tomoyoshi Ono, Yuki Moribe |
| Rok vydání: |
2007 |
| Předmět: |
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| Zdroj: |
Nuclear Physics B. 764:168-182 |
| ISSN: |
0550-3213 |
| DOI: |
10.1016/j.nuclphysb.2006.12.004 |
| Popis: |
We introduce a U(1) lattice gauge theory with dual gauge fields and study its phase structure. This system is partly motivated by unconventional superconductors like extended s-wave and d-wave superconductors in the strongly-correlated electron systems and also studies of the t – J model in the slave-particle representation. In this theory, the “Cooper-pair” (or RVB spinon-pair) field is put on links of a cubic lattice due to strong on-site repulsion between original electrons in contrast to the ordinary s-wave pair field on sites. This pair field behaves as a gauge field dual to the U(1) gauge field coupled with the hopping of electrons or quasi-particles of the t – J model, holons and spinons. By Monte Carlo simulations we study this lattice gauge model and find a first-order phase transition from the normal state to the Higgs (superconducting) phase. Each gauge field works as a Higgs field for the other gauge field. This mechanism requires no scalar fields in contrast to the ordinary Higgs mechanism. An explicit microscopic model is introduced, the low-energy effective theory of which is viewed as a special case of the present model. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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