General quantum fidelity susceptibilities for the J1-J2 chain

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 toward 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, χρ, χD, and χAF, which are related to the spin stiffness, the dimer order, and …