Ground state overlap and quantum phase transitions

Details Ground state overlap and quantum phase transitions Ground state overlap and quantum phase transitions

2005-12-29

arxiv.org/abs/quant-ph/0512249v2

Phys. Rev. E 74, 031123 (2006)

Physics

Quantum Physics

5 pages. Version to be published, title changed

Scientific paper

10.1103/PhysRevE.74.031123

We present a characterization of quantum phase transitions in terms of the the overlap function between two ground states obtained for two different values of external parameters. On the examples of the Dicke and XY models, we show that the regions of criticality of a system are marked by the extremal points of the overlap and functions closely related to it. Further, we discuss the connections between this approach and the Anderson orthogonality catastrophe as well as with the dynamical study of the Loschmidt echo for critical systems.

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