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arXiv 1612.04789cond-mat.stat-mech
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非均匀自由费米子链的纠缠

Entanglement of heterogeneous free fermion chains

Yuchi He

摘要:

我们计算了自由费米子链中两个异质部分之间的基态纠缠熵。这两部分可以是参数不同的XX链,也可以是一个XX半链与一个量子伊辛半链相连。结果表明,对数行为举行,如果这两个部分是共形临界。在其他情况下,面积定律也成立,并具有丰富的收敛行为。特别地,当XX链在Lifshitz点处与共形或Lifshitz临界部分相连时,纠缠熵以分数阶次领先指数代数收敛.

英文摘要:

We calculate the ground state entanglement entropy between two heterogeneous parts of a free fermion chain. The two parts could be XX chains with different parameters or an XX half chain connected with a quantum Ising half chain. It is shown that logarithmic behavior holds if the two parts are conformally critical. In other cases, area law holds with abundant convergence behaviors. In particular, when XX chain at Lifshitz point is connected with a conformally or Lifshitz critical part, entanglement entropy converges algebraically with a fractional subleading index.

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