Quantum renormalization group of XY model in two dimensions

TL;DR

This paper studies entanglement and quantum phase transitions in a two-dimensional XY spin model using quantum renormalization group techniques, revealing critical behavior and phase transition characteristics.

Contribution

It applies quantum renormalization group to analyze entanglement and phase transitions in 2D XY models, highlighting differences from 1D cases and exploring scaling behavior.

Findings

Concurrence reaches non-zero at critical point faster than in 1D.

Discontinuous first derivative of concurrence indicates second-order phase transition.

Scaling behavior of entanglement near criticality is characterized.

Abstract

We investigate entanglement and quantum phase transition (QPT) in a two-dimensional Heisenberg anisotropic spin-1/2 XY model, using quantum renormalization group method (QRG) on a square lattice of $N\times N$ sites. The entanglement through geometric average of concurrences is calculated after each step of the QRG. We show that the concurrence achieves a non zero value at the critical point more rapidly as compared to one-dimensional case. The relationship between the entanglement and the quantum phase transition is studied. The evolution of entanglement develops two saturated values corresponding to two different phases. We compute the first derivative of the concurrence, which is found to be discontinuous at the critical point $\gamma=0$, and indicates a second-order phase transition in the spin system. Further, the scaling behaviour of the system is investigated by computing the first derivative of the concurrence in terms of the system size.