Density-functional fidelity approach to quantum phase transitions

Details Density-functional fidelity approach to quantum phase transitions Density-functional fidelity approach to quantum phase transitions

2008-09-23

arxiv.org/abs/0809.3856v1

Chin. Phys. Lett. 26, 026401 (2009)

Physics

Quantum Physics

4 pages, 2 figures, submitted to Chin. Phys. Lett

Scientific paper

10.1088/0256-307X/26/2/026401

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, as we will show, is 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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