Ground state overlap and quantum phase transitions.

  title={Ground state overlap and quantum phase transitions.},
  author={Paolo Zanardi and Nikola Paunkov{\'i}c},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  volume={74 3 Pt 1},
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… CONTINUE READING
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