One-band Hubbard model with hopping asymmetry and the effective theory at finite U: Phase diagram and metal-insulator transition
文献类型：期刊论文
| 作者 | Wen, YC; Yu, Y ; Wen, YC , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
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| 刊名 | PHYSICAL REVIEW B
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| 出版日期 | 2005 |
| 卷号 | 72期号:4页码:- |
| 关键词 | Valence-bond State Pairing Correlations Antiferromagnetism Superconductivity La2cuo4 |
| ISSN号 | 1098-0121 |
| 英文摘要 | We study the one-band Hubbard model at half filling with hopping asymmetry and its effective model at finite but large U up to the second order of t(mix)/U. Two variational wave functions, the resonating valence bond (RVB) wave function and antiferromagnetic (AF) RVB coexisted wave function, are studied by variational Monte Carlo method on LxL square lattices up to L=12. Based on these two wave functions, the phase diagrams for both models are presented. For the Hubbard model, we find that there is a metal-insulator transition when the hopping parameter t(mix) which changes the local double occupant vanishes while only a metal-insulator crossover is explored for any finite t(mix). For the effective model in which the perturbation expansion is up to the second order of t(mix)/U, a clear metal-insulator transition can be identified for both variational wave functions and the phase diagram can be drawn accordingly. In both models, we find that the systems are dominated by AF-RVB wave function when U is large while the RVB wave function is favored when U is small. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| WOS记录号 | WOS:000230890300046 |
| 公开日期 | 2012-08-30 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/13797]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 通讯作者 | Wen, YC , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Wen, YC,Yu, Y,Wen, YC , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.. One-band Hubbard model with hopping asymmetry and the effective theory at finite U: Phase diagram and metal-insulator transition[J]. PHYSICAL REVIEW B,2005,72(4):-. |
| APA | Wen, YC,Yu, Y,&Wen, YC , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China..(2005).One-band Hubbard model with hopping asymmetry and the effective theory at finite U: Phase diagram and metal-insulator transition.PHYSICAL REVIEW B,72(4),-. |
| MLA | Wen, YC,et al."One-band Hubbard model with hopping asymmetry and the effective theory at finite U: Phase diagram and metal-insulator transition".PHYSICAL REVIEW B 72.4(2005):-. |
入库方式： OAI收割
来源：理论物理研究所
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