复合自由费米子系统中的纠缠
Entanglement in composite free-fermion systems
摘要：
我们考虑费米子链的两个半是金属具有不同的带宽或金属和绝缘体。两者通过一种特殊的键结合在一起。我们研究了两个粒子之间的基态纠缠熵，纠缠熵对参数的依赖关系以及纠缠熵的渐近形式。我们还讨论了两个子系统中纠缠哈密顿量的特征以及两个子系统合并后纠缠熵的演化。
英文摘要：
We consider fermionic chains where the two halves are either metals with different bandwidths or a metal and an insulator. Both are coupled together by a special bond. We study the ground-state entanglement entropy between the two pieces, its dependence on the parameters and its asymptotic form. We also discuss the features of the entanglement Hamiltonians in both subsystems and the evolution of the entanglement entropy after joining the two parts of the system.
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