Universality in entanglement of quasiparticle excitations
Universality in entanglement of quasiparticle excitations
复制标题
准粒子激发纠缠的普遍性
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Iztok Pižorn
中科院分区：
文献类型：
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作者：
Iztok Pižorn
我们证明了当一维系统的关联长度有限时，系统的单准粒子激发态的纠缠熵超过基态纠缠熵（log（2））.对于二次费米子系统，我们发现纠缠的过剩与激发态的准粒子数有关。一维量子多体系统，包括不可积的数值例子证实了这一观察。讨论了描述准粒子激发的张量网络方法。
We show that the entanglement entropy of single quasiparticle excitations of one dimensional systems exceeds the ground state entanglement entropy for log(2), if the correlation length of the system is finite. For quadratic fermion systems we show that the excess of entanglement is related to the number of quasiparticles in the excited state. This observation is confirmed by numerical examples of one dimensional quantum many-body systems, including nonintegrable. Tensor network methods to describe quasiparticle excitations are discussed.