Fidelity approach to Gaussian transitions

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The fidelity approach to the Gaussian transitions in spin-one XXZ spin chains with three different values of Ising-like anisotropy lambda is analyzed by means of the density matrix renormalization group (DMRG) technique for systems of large sizes. We find that, despite the success in the cases of lambda=2.59 and 1, the fidelity susceptibility fails to detect the Gaussian transition for lambda=0.5. Thus our results demonstrate the limitation of the fidelity susceptibility in characterizing quantum phase transitions, which was proposed recently in general frameworks.
9 pages, 9 figures

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Quantum Physics, Statistical Mechanics

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http://salesiana.dossiersoluciones.com/handle/123456789/162871

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0804.0537
 http://arxiv.org/abs/0804.0537
 Phys. Rev. A 77, 062321 (2008)
 doi:10.1103/PhysRevA.77.062321

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arXiv