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arXiv 2406.04865cond-mat.mes-hall
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驱动合成反铁磁体中纠缠磁振子对的产生

Entangled magnon-pair generation in a driven synthetic antiferromagnet

Artim L. Bassant, Mexx E. Y. Regout, Joren S. Harms, Rembert A. Duine

AI总结:

本文研究自旋轨道矩驱动合成反铁磁体中磁振子对的量子自发产生机制,类比霍金辐射,计算了磁振子流与可观测温度,并发现磁振子对具有纠缠特性,为量子磁振子学应用提供新途径。

摘要:

理解、操控并利用磁振子——自旋波的量子——以实现高能效应用,是磁振子学的首要目标之一。本文研究一种合成反铁磁体,其中一层铁磁层由自旋轨道矩驱动。我们发现,在自旋轨道矩大小和外加磁场的特定条件下,磁振子对会通过量子涨落自发产生,其方式类似于黑洞视界附近的霍金辐射对产生。其中一个磁振子在合成反铁磁体某一磁性层中靠近间隔层界面的位置产生,而另一个磁振子则在另一磁性层中产生。我们计算了由这些自发产生的磁振子对所导致的磁振子流,并估算了在低于某一温度时它们应当可以被观测到。此外,我们发现这些磁振子是纠缠的,这使得它们在未来量子磁振子学应用中具有重要价值。

英文摘要:

Understanding, manipulating, and using magnons - the quanta of spin waves - for energy-efficient applications is one of the primary goals of magnonics. In this paper, we consider a synthetic antiferromagnet in which one of the ferromagnetic layers is driven by spin-orbit torque. We find that under specific conditions for the magnitude of the spin-orbit torque and field, magnon pairs are spontaneously produced by quantum fluctuations in a way that is similar to Hawking pair production near black-hole horizons. One of the magnons is generated near the interface with the spacer layer in one of the magnetic layers of the synthetic antiferromagnet, while the other magnon is produced in the other magnetic layer. We compute the magnon current due to these spontaneously generated magnon pairs and estimate the temperature below which they should become observable. Additionally, we find that the magnons are entangled, which makes them interesting for future applications in quantum magnonics.

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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