Abstract
The fidelity susceptibility and entanglement entropy in a system of two-leg XXZ spin ladder with rung coupling is investigated by using exact diagonalization of the system. The effects of rung coupling on fidelity susceptibility, entanglement entropy, and quantum phase transition are analyzed. It is found that the quantum phase transition between two different XY phases can be well-characterized by the fidelity susceptibility. Although the quantum phase transition from XY phase to rung singlet phase can be hardly detected by fidelity susceptibility, it can be predicted by the first derivative of the entanglement entropy of the system.
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