Superconductivity, Antiferromagnetism, and Kinetic Correlation in Strongly Correlated Electron Systems
We investigate the ground state of two-dimensional Hubbard model on the basis of the variational Monte Carlo method. We use wave functions that include kinetic correlation and doublon-holon correlation beyond the Gutzwiller ansatz. It is still not clear whether the Hubbard model accounts for high-te...
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | Advances in Condensed Matter Physics |
| Online Access: | http://dx.doi.org/10.1155/2015/141263 |
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| _version_ | 1832565701854887936 |
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| author | Takashi Yanagisawa |
| author_facet | Takashi Yanagisawa |
| author_sort | Takashi Yanagisawa |
| collection | DOAJ |
| description | We investigate the ground state of two-dimensional Hubbard model on the basis of the variational Monte Carlo method. We use wave functions that include kinetic correlation and doublon-holon correlation beyond the Gutzwiller ansatz. It is still not clear whether the Hubbard model accounts for high-temperature superconductivity. The antiferromagnetic correlation plays a key role in the study of pairing mechanism because the superconductive phase exists usually close to the antiferromagnetic phase. We investigate the stability of the antiferromagnetic state when holes are doped as a function of the Coulomb repulsion U. We show that the antiferromagnetic correlation is suppressed as U is increased exceeding the bandwidth. High-temperature superconductivity is possible in this region with enhanced antiferromagnetic spin fluctuation and pairing interaction. |
| format | Article |
| id | doaj-art-263469a5335c4108bb06302839187f80 |
| institution | Kabale University |
| issn | 1687-8108 1687-8124 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Condensed Matter Physics |
| spelling | doaj-art-263469a5335c4108bb06302839187f802025-02-03T01:06:56ZengWileyAdvances in Condensed Matter Physics1687-81081687-81242015-01-01201510.1155/2015/141263141263Superconductivity, Antiferromagnetism, and Kinetic Correlation in Strongly Correlated Electron SystemsTakashi Yanagisawa0Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, JapanWe investigate the ground state of two-dimensional Hubbard model on the basis of the variational Monte Carlo method. We use wave functions that include kinetic correlation and doublon-holon correlation beyond the Gutzwiller ansatz. It is still not clear whether the Hubbard model accounts for high-temperature superconductivity. The antiferromagnetic correlation plays a key role in the study of pairing mechanism because the superconductive phase exists usually close to the antiferromagnetic phase. We investigate the stability of the antiferromagnetic state when holes are doped as a function of the Coulomb repulsion U. We show that the antiferromagnetic correlation is suppressed as U is increased exceeding the bandwidth. High-temperature superconductivity is possible in this region with enhanced antiferromagnetic spin fluctuation and pairing interaction.http://dx.doi.org/10.1155/2015/141263 |
| spellingShingle | Takashi Yanagisawa Superconductivity, Antiferromagnetism, and Kinetic Correlation in Strongly Correlated Electron Systems Advances in Condensed Matter Physics |
| title | Superconductivity, Antiferromagnetism, and Kinetic Correlation in Strongly Correlated Electron Systems |
| title_full | Superconductivity, Antiferromagnetism, and Kinetic Correlation in Strongly Correlated Electron Systems |
| title_fullStr | Superconductivity, Antiferromagnetism, and Kinetic Correlation in Strongly Correlated Electron Systems |
| title_full_unstemmed | Superconductivity, Antiferromagnetism, and Kinetic Correlation in Strongly Correlated Electron Systems |
| title_short | Superconductivity, Antiferromagnetism, and Kinetic Correlation in Strongly Correlated Electron Systems |
| title_sort | superconductivity antiferromagnetism and kinetic correlation in strongly correlated electron systems |
| url | http://dx.doi.org/10.1155/2015/141263 |
| work_keys_str_mv | AT takashiyanagisawa superconductivityantiferromagnetismandkineticcorrelationinstronglycorrelatedelectronsystems |