| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Density-Functional Fidelity Approach to Quantum Phase Transitions |
| GU Shi-Jian
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| Department of Physics and ITP, The Chinese University of Hong Kong, Hong Kong |
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| Cite this article: |
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GU Shi-Jian 2009 Chin. Phys. Lett. 26 026401 |
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Abstract
We propose a new approach to quantum phase transitions in terms of the density-functional fidelity, which measures the similarity between density distributions of two ground states in parameter space. The key feature of the approach is such that the density-functional fidelity can be measured easily in experiments. Both the validity and versatility of the approach are checked by the Lipkin-Meshkov-Glick model and the one-dimensional Hubbard model.
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| Keywords:
64.60.-i
71.15.Mb
75.10.Jm
71.10.Fd
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Received: 24 September 2008
Published: 20 January 2009
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| PACS: |
64.60.-i
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(General studies of phase transitions)
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71.15.Mb
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(Density functional theory, local density approximation, gradient and other corrections)
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75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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71.10.Fd
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(Lattice fermion models (Hubbard model, etc.))
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