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• W2046373397 abstract "The behavior of the ground-state fidelity susceptibility in the vicinity of a quantum critical point is investigated. We derive scaling relations describing its singular behavior in the quantum critical regime. Unlike it has been found in previous studies, these relations are solely expressed in terms of conventional critical exponents. We also describe in detail a quantum Monte Carlo scheme that allows for the evaluation of the fidelity susceptibility for a large class of many-body systems and apply it in the study of the quantum phase transition for the transverse-field Ising model on the square lattice. Finite size analysis applied to the so obtained numerical results confirm the validity of our scaling relations. Furthermore, we analyze the properties of a closely related quantity, the ground-state energy's second derivative, that can be numerically evaluated in a particularly efficient way. The usefulness of both quantities as alternative indicators of quantum criticality is examined." @default.
• W2046373397 created "2016-06-24" @default.
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• W2046373397 date "2010-02-18" @default.
• W2046373397 modified "2023-10-17" @default.
• W2046373397 title "Quantum critical scaling of fidelity susceptibility" @default.
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• W2046373397 doi "https://doi.org/10.1103/physrevb.81.064418" @default.
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