Oscillating terms in the Renyi entropy of Fermi gases and liquids

Oscillating terms in the Renyi entropy of Fermi gases and liquids
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费米气体和液体的 Renyi 熵中的振荡项

DOI:
10.1103/physrevb.87.235112
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
N. Tubman
N. Tubman
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Brian Swingle;J. Mcminis;N. Tubman

文献摘要

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在这项工作中,我们计算了费米气体和费米液体的Renyi熵中对应于$2k_F$类振荡的次领先振荡项。我们的理论工具是费米液体纠缠的一维公式,在讨论对数违反面积定律和量子蒙特卡罗计算时很熟悉。主要结果是一个振荡项的公式,适用于任何区域几何和球面费米曲面。我们用相关函数法将这一项与纠缠的数值计算进行比较,发现非常吻合。我们还比较了相互作用费米液体的量子蒙特卡罗数据,在那里我们也发现了非常好的一致性,直到中等相互作用强度。
In this work we compute subleading oscillating terms in the Renyi entropy of Fermi gases and Fermi liquids corresponding to $2k_F$-like oscillations. Our theoretical tools are the one dimensional formulation of Fermi liquid entanglement familiar from discussions of the logarithmic violation of the area law and quantum Monte Carlo calculations. The main result is a formula for the oscillating term for any region geometry and a spherical Fermi surface. We compare this term to numerical calculations of entanglement using the correlation function method and find excellent agreement. We also compare with quantum Monte Carlo data on interacting Fermi liquids where we also find excellent agreement up to moderate interaction strengths.