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arXiv 1904.04553cond-mat.mes-hallcond-mat.mtrl-sciphysics.opticsquant-ph
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量子关联下的反铁磁振子:高压缩Fock态

Antiferromagnetic magnons as highly squeezed Fock states underlying quantum correlations

Akashdeep Kamra, Even Thingstad, Gianluca Rastelli, Rembert A. Duine, Arne Brataas, Wolfgang Belzig, Asle Sudbø

摘要:

利用量子光学中双模压缩态的概念,我们给出了反铁磁基态和激发态的物理图象。在N{é}el有序组态上叠加的自旋翻转被限制在一个子晶格上,称为子晶格磁振子。我们发现,反铁磁自旋上的磁振子是由一个量子叠加态与$n+1$自旋上和$n$自旋下的亚晶格磁振子,因此是一个巨大的激发,尽管它的单位净自旋。因此,它的大的亚晶格自旋可以放大它与其他激发的耦合。采用冯诺伊曼熵作为一种措施,我们表明,反铁磁本征模表现出高度的纠缠之间的两个亚晶格,从而建立反铁磁水库强量子关联。基于这些新的见解,我们概述了利用强量子特性的反铁磁(压缩)磁振子的战略,并给出了一个直观的解释最近的实验和理论研究结果在反铁磁磁振子自旋电子学。

英文摘要:

Employing the concept of two-mode squeezed states from quantum optics, we demonstrate a revealing physical picture for the antiferromagnetic ground state and excitations. Superimposed on a N{é}el ordered configuration, a spin-flip restricted to one of the sublattices is called a sublattice-magnon. We show that an antiferromagnetic spin-up magnon is comprised by a quantum superposition of states with $n+1$ spin-up and $n$ spin-down sublattice-magnons, and is thus an enormous excitation despite its unit net spin. Consequently, its large sublattice-spin can amplify its coupling to other excitations. Employing von Neumann entropy as a measure, we show that the antiferromagnetic eigenmodes manifest a high degree of entanglement between the two sublattices, thereby establishing antiferromagnets as reservoirs for strong quantum correlations. Based on these novel insights, we outline strategies for exploiting the strong quantum character of antiferromagetic (squeezed-)magnons and give an intuitive explanation for recent experimental and theoretical findings in antiferromagnetic magnon spintronics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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