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• W2077899295 abstract "We study slightly generalized quantum fidelity susceptibilities where the differential change in the fidelity is measured with respect to a different term than the one used for driving the system towards a quantum phase transition. As a model system we use the spin-1/2 J1-J2 antiferromagnetic Heisenberg chain. For this model, we study three fidelity susceptibilities, chi_p, chi_D and chi_AF, which are related to the spin stiffness, the dimer order and antiferromagnetic order, respectively. All these ground-state fidelity susceptibilities are sensitive to the phase diagram of the J1-J2 model. We show that they all can accurately identify a quantum critical point in this model occurring at J2 = 0.241J1 between a gapless Heisenberg phase for J2 < J2_critical and a dimerized phase for J2 > J2_critical. This phase transition, in the Berezinskii-Kosterlitz-Thouless universality class, is controlled by a marginal operator and is therefore particularly difficult to observe." @default.
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• W2077899295 date "2011-12-28" @default.
• W2077899295 modified "2023-09-24" @default.
• W2077899295 title "General quantum fidelity susceptibilities for the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mi>J</mml:mi><mml:mn>1</mml:mn></mml:msub></mml:math>-<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mi>J</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>chain" @default.
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• W2077899295 doi "https://doi.org/10.1103/physrevb.84.224435" @default.
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