Non-local correlations in the Haldane phase for an XXZ spin-1 chain: A perspective from infinite matrix product state representation

Abstract

String correlations are investigated in an infinite-size XXZ spin-1 chain. By using the infinite matrix product state representation, we calculate a long-range string order. In the XY phase, the string correlations decay within a relatively very large lattice distance, which makes a finite-size study difficult to verify the non-existence of the string order. Thus, in the Haldane phase, the non-vanishing string correlations in the limit of a very large distance allow to characterize the phase boundaries to the XY phase and the Neel phase, which implies that the transverse long-range string order is the order parameter for the Haldane phase. In addition, the singular behaviors of the von Neumann entropy and the fidelity per lattice site are shown to capture clearly the phase transition points that are consistent with the results from the string order. The estimated critical points including a BKT transition from the XY phase to the Haldane phase agree well with the previous results: ${\Delta }_{c2}=0$ for the XY-Haldane phase transition and ${\Delta }_{c3}=1.185$ for the Haldane-N'eel phase transition from the density renormalization group. From a finite-entanglement scaling of the von Neumann entropy with respect to the truncation dimension, the central charges are found to be $c\simeq 1.0$ at ${\Delta }_{c2}=0$ and $c\simeq 0.5$ at ${\Delta }_{c3}=1.185$, respectively, which shows that the XY-Haldane phase transition at ${\Delta }_{c2}=0$ belongs to the Heisenberg universality class, while the Haldane-Neel phase transition at ${\Delta }_{c2}=1.185$ belongs to the two-dimensional classical Ising universality class. It is also shown that, the long-range order parameters and the von Neumann entropy, as well as the fidelity per site approach, can be applied to characterize quantum phase transitions as a universal phase transition indicator for one-dimensional lattice many-body systems.

12 pages, 12 figures

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• Entanglement entropy and massless phase in the antiferromagnetic three-state quantum chiral clock model
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• Quantum Simulation of Spin-1 XXZ-Heisenberg Models and the Haldane Phase with Dysprosium
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