Entanglement at a Two-Dimensional Quantum Critical Point: a Numerical Linked Cluster Expansion Study
We develop a method to calculate the bipartite entanglement entropy of quantum models, in the thermodynamic limit, using a Numerical Linked Cluster Expansion (NLCE) involving only rectangular clusters. It is based on exact diagonalization of all n x m rectangular clusters at the interface between en...
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| creator | Kallin, Ann B Hyatt, Katharine Singh, Rajiv R P Melko, Roger G |
| description | We develop a method to calculate the bipartite entanglement entropy of quantum models, in the thermodynamic limit, using a Numerical Linked Cluster Expansion (NLCE) involving only rectangular clusters. It is based on exact diagonalization of all n x m rectangular clusters at the interface between entangled subsystems A and B. We use it to obtain the Renyi entanglement entropy of the two-dimensional transverse field Ising model, for arbitrary real Renyi index alpha. Extrapolating these results as a function of the order of the calculation, we obtain universal pieces of the entanglement entropy associated with lines and corners at the quantum critical point. They show NLCE to be one of the few methods capable of accurately calculating universal properties of arbitrary Renyi entropies at higher dimensional critical points. |
| doi_str_mv | 10.48550/arxiv.1212.5269 |
| format | Article |
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| subjects | Clusters Critical point Entanglement Entropy (Information theory) Ising model Mathematical models Physics - Quantum Physics Physics - Statistical Mechanics Subsystems Two dimensional models |
| title | Entanglement at a Two-Dimensional Quantum Critical Point: a Numerical Linked Cluster Expansion Study |
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