支撑Fe链中的极长寿命磁激发
Extremely long-lived magnetic excitations in supported Fe chains
摘要：
本文对Cu_2N/Cu（100）上奇数个Fe原子组成的自旋链的第一激发态的寿命进行了理论研究。Yan等人（Nat. Nanotech. 10，40（2015））最近在Fe 3链的情况下观察到非常长的寿命。我们考虑了衬底中电子-空穴对的产生引起的第一激发态的衰减。对于有限磁场，链中最低的两个态具有准Néel态结构。从一种状态到另一种状态的衰变强烈地依赖于链中局部自旋的纠缠程度。链中的缠结说明了随着链长度呈指数增加的长寿命。尽管奇链和偶链的性质明显不同，但它们的行为受到同一种现象的支配，特别是纠缠效应。目前的结果很好地解释了Yan等人最近在Fe 3上测量的寿命
英文摘要：
We report on a theoretical study of the lifetime of the first excited state of spin chains made of an odd number of Fe atoms on Cu2N/Cu(100). Yan et al (Nat. Nanotech. 10, 40 (2015)) recently observed very long lifetimes in the case of Fe3 chains. We consider the decay of the first excited state induced by electron-hole pair creation in the substrate. For a finite magnetic field, the two lowest-lying states in the chain have a quasi-Néel state structure. Decay from one state to the other strongly depends on the degree of entanglement of the local spins in the chain. The entanglement in the chain accounts for the long lifetimes that increase exponentially with chain length. Despite their apparently very different properties, the behaviour of odd and even chains is governed by the same kind of phenomena, in particular entanglement effects. The present results account quite well for the lifetimes recently measured by Yan et al on Fe3
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