Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2009-05-13
Phys. Rev. A, 80, 012303 (2009)
Physics
Condensed Matter
Statistical Mechanics
8 pages, 4 figures
Scientific paper
10.1103/PhysRevA.80.012303
The ground-state fidelity has been introduced recently as a tool to investigate quantum phase transitions. Here, we apply this concept in the context of a crossover problem. Specifically, we calculate the fidelity susceptibility for the BCS ground-state wave function, when the intensity of the fermionic attraction is varied from weak to strong in an interacting Fermi system, through the BCS-BEC crossover. Results are presented for contact and finite-range attractive potentials and for both continuum and lattice models. We conclude that the fidelity susceptibility can be useful also in the context of crossover problems.
Khan Ashfaq A.
Pieri Pierbiagio
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