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Ferromagnetism in one-dimensional Hubbard model induced by the next-nearest-neighbor hopping at electron density 3/2 |
Yang Yuan-Yuan (杨媛媛), Zhang Jian (张健), Pan Hui (潘晖), Wang Hai-Long (王海龙) |
State Key Laboratory of Software Development Environment and Department of Physics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China |
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Abstract Ferromagnetism in the one-dimensional Hubbard model with the next-nearest-neighbor hopping is explored by using the exact-diagonalization method in a small cluster and the equation-of-motion method in the thermodynamic limit with electron density n=3/2. With these two complementary methods, it is found that an intermediate value of the next-nearest-neighbor hopping amplitude t1 tends to stabilize the fully polarized ferromagnetic state under the condition that the on-site coulomb interaction U is sufficiently large in our model. The ground-state phase diagram of the model is presented in the t1-U plane.
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Received: 21 November 2013
Revised: 10 April 2014
Accepted manuscript online:
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PACS:
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71.10.Fd
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(Lattice fermion models (Hubbard model, etc.))
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71.30.+h
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(Metal-insulator transitions and other electronic transitions)
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71.27.+a
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(Strongly correlated electron systems; heavy fermions)
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Fund: Project supported by the State Key Laboratory of Software Development Environment, China (Grant No. SKLSDE-2013ZX-21), the National Natural Science Foundation of China (Grant No. 50971011), and the Beijing Natural Science Foundation, China (Grant No. 1102025). |
Corresponding Authors:
Wang Hai-Long
E-mail: nhlwang@buaa.edu.cn
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Cite this article:
Yang Yuan-Yuan (杨媛媛), Zhang Jian (张健), Pan Hui (潘晖), Wang Hai-Long (王海龙) Ferromagnetism in one-dimensional Hubbard model induced by the next-nearest-neighbor hopping at electron density 3/2 2014 Chin. Phys. B 23 117101
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