Fidelity approach to Gaussian transitions

Details Fidelity approach to Gaussian transitions Fidelity approach to Gaussian transitions

2008-04-03

arxiv.org/abs/0804.0537v1

Phys. Rev. A 77, 062321 (2008)

Physics

Quantum Physics

9 pages, 9 figures

Scientific paper

10.1103/PhysRevA.77.062321

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.

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