Logarithmic divergence of the block entanglement entropy for the ferromagnetic Heisenberg model

Logarithmic divergence of the block entanglement entropy for the ferromagnetic Heisenberg model
复制标题

铁磁海森堡模型的块纠缠熵的对数散度

DOI:
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发表时间:
2004
期刊:
影响因子:
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通讯作者:
M. Salerno
M. Salerno
中科院分区:
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文献类型:
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作者:
V. Popkov;M. Salerno

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最近的研究表明,纠缠熵的对数散度作为子系统大小的函数是量子模型中临界性的标志。我们证明,每个位点磁化强度 y 固定的扇区中长度为 L 的铁磁海森堡自旋 (1/2) 链的 n 个位点的基态纠缠熵增长为 (1/2)log{sub 2}[n(L-n)/L]C(y),其中 C(y)=2{pi}e((1/4)-y{sup 2})
Recent studies have shown that logarithmic divergence of entanglement entropy as a function of the size of a subsystem is a signature of criticality in quantum models. We demonstrate that the ground-state entanglement entropy of n sites for the ferromagnetic Heisenberg spin-(1/2) chain of the length L in a sector with fixed magnetization y per site grows as (1/2)log{sub 2}[n(L-n)/L]C(y), where C(y)=2{pi}e((1/4)-y{sup 2})