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
中科院分区:
文献类型:
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作者:
V. Popkov;M. Salerno
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})