Negativity as the entanglement measure to probe the Kondo regime in the spin-chain Kondo model
Negativity as the entanglement measure to probe the Kondo regime in the spin-chain Kondo model
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DOI：
10.1103/physrevb.81.064429
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发表时间：
2010-02-01
影响因子：
3.7
通讯作者：
Bose, Sougato
中科院分区：
文献类型：
--
作者：
Bayat, Abolfazl;Sodano, Pasquale;Bose, Sougato
我们研究了自旋链一端的杂质与自旋块的纠缠，利用负性作为纠缠的真实度量来表征自旋链Kondo模型中无隙Kondo区的独特特征。对于这个自旋链在近藤制度，我们确定了一个真正的纠缠测量的近藤屏蔽云的空间范围，我们提出了一个antonymous其基态，并证明杂质自旋确实是最大限度地纠缠云。为了更好地证明近藤制度的特殊性，我们进行了一个平行的近藤自旋链模型的纠缠特性的分析在带隙二聚化制度。我们的研究表明，一个真正的纠缠措施源于量子信息理论可以充分表征也非微扰制度访问某些凝聚态系统。
We study the entanglement of an impurity at one end of a spin chain with a block of spins using negativity as a true measure of entanglement to characterize the unique features of the gapless Kondo regime in the spin-chain Kondo model. For this spin chain in the Kondo regime we determine-with a true entanglement measure-the spatial extent of the Kondo screening cloud, we propose an ansatz for its ground state and demonstrate that the impurity spin is indeed maximally entangled with the cloud. To better evidence the peculiarities of the Kondo regime, we carry a parallel analysis of the entanglement properties of the Kondo spin-chain model in the gapped dimerized regime. Our study shows how a genuine entanglement measure stemming from quantum information theory can fully characterize also nonperturbative regimes accessible to certain condensed matter systems.