2014年12月
Superconductivity, antiferromagnetism, and phase separation in the two-dimensional Hubbard model: A dual-fermion approach
PHYSICAL REVIEW B
- ,
- ,
- 巻
- 90
- 号
- 23
- 開始ページ
- 235132-1
- 終了ページ
- 235132-12
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.90.235132
- 出版者・発行元
- AMER PHYSICAL SOC
The dual-fermion approach offers a way to perform diagrammatic expansion around the dynamical mean field theory. Using this formalism, the influence of antiferromagnetic fluctuations on the self-energy is taken into account through ladder-type diagrams in the particle-hole channel. The resulting phase diagram for the (quasi-) two-dimensional Hubbard model exhibits antiferromagnetism and d-wave superconductivity. Furthermore, a uniform charge instability, i.e., phase separation, is obtained in the low-doping regime around the Mott insulator. We also examine spin/charge density wave fluctuations including d-wave symmetry. The model exhibits a tendency towards an unconventional charge density wave, but no divergence of the susceptibility is found.
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevB.90.235132
- ISSN : 1098-0121
- eISSN : 1550-235X
- Web of Science ID : WOS:000349342700002