Fidelity approach to the disordered quantum XY model

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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.
4 pages, 3 figures; references added

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Quantum Physics, Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/218450

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0808.4140
 http://arxiv.org/abs/0808.4140
 Phys. Rev. Lett. 102, 057205 (2009)
 doi:10.1103/PhysRevLett.102.057205

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arXiv