期刊
PHYSICAL REVIEW B
卷 83, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.224410
关键词
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资金
- NSF [DMR-0803200]
- Yale Center for Quantum Information Physics [DMR-0653377]
- Deutsche Forschungsgemeinschaft [RA 1949/1-1]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0803200] Funding Source: National Science Foundation
We compute the von Neumann and generalized Renyi entanglement entropies in the ground-state of the spin-1/2 antiferromagnetic Heisenberg model on the square lattice using the modified spin-wave theory for finite lattices. The addition of a staggered magnetic field to regularize the zero modes associated with symmetry breaking is shown to be essential for obtaining well-behaved values for the entanglement entropy. The von Neumann and Renyi entropies obey an area law with additive logarithmic corrections, and are in good quantitative agreement with numerical results from valence bond quantum Monte Carlo and density matrix renormalization group calculations. We also compute the spin fluctuations and observe a multiplicative logarithmic correction to the area law in excellent agreement with quantum Monte Carlo calculations.
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