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Negativity in the Extended Hubbard Model under External Magnetic Field |
| YANG Zhen;NING Wen-Qiang |
| Department of Physics, Fudan University, Shanghai 200433Department of Physics, Chinese University of Hong Kong, Hong Kong |
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| Cite this article: |
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YANG Zhen, NING Wen-Qiang 2008 Chin. Phys. Lett. 25 31-34 |
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Abstract We exactly calculate the negativity, a measurement of entanglement, in the two-site extended Hubbard model with external magnetic field. Its behaviour at different temperatures is presented. The negativity reduces with the increasing temperature or with the increasing uniform external magnetic field. It is also found that a non-uniform external magnetic field can be used to
modulate or to increase the negativity.
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| Keywords:
03.67.Mn
03.65.Ud
71.10.Fd
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Received: 27 July 2007
Published: 27 December 2007
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| PACS: |
03.67.Mn
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(Entanglement measures, witnesses, and other characterizations)
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03.65.Ud
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(Entanglement and quantum nonlocality)
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71.10.Fd
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(Lattice fermion models (Hubbard model, etc.))
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