2009年7月
Quantum Phase Transitions in the Hubbard Model on a Triangular Lattice
PHYSICAL REVIEW LETTERS
- ,
- ,
- 巻
- 103
- 号
- 3
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevLett.103.036401
- 出版者・発行元
- AMER PHYSICAL SOC
We investigate the quantum phase transitions in the half-filled Hubbard model on the triangular lattice by means of the path-integral renormalization group method with a new iteration and truncation scheme proposed recently. It is found for a cluster of 36 sites that as the Hubbard interaction U increases, the paramagnetic metallic state undergoes a first-order phase transition to a nonmagnetic insulating (NMI) state at U-c1 similar to 7.4t, which is followed by another first-order transition to a 120 degrees Neacuteel ordered state at U-c2 similar to 9.2t, where t is the transfer integral. The size dependence of the results is also addressed. Our results suggest the existence of the intermediate NMI phase and resolve some controversial arguments on the nature of the previously proposed quantum phase transitions.
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevLett.103.036401
- ISSN : 0031-9007
- Web of Science ID : WOS:000268088300046