Fidelity approach to the disordered quantum XY model

Details Fidelity approach to the disordered quantum XY model Fidelity approach to the disordered quantum XY model

2008-08-29

arxiv.org/abs/0808.4140v3

Phys. Rev. Lett. 102, 057205 (2009)

Physics

Quantum Physics

4 pages, 3 figures; references added

Scientific paper

10.1103/PhysRevLett.102.057205

We study the random XY spin chain in a transverse field by analyzing the susceptibility of the ground state fidelity, numerically evaluated through a standard mapping of the model onto quasi-free fermions. It is found that the fidelity susceptibility and its scaling properties provide useful information about the phase diagram. In particular it is possible to determine the Ising critical line and the Griffiths phase regions, in agreement with previous analytical and numerical results.

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