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arXiv 2009.07948cond-mat.mes-hallquant-ph
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非共振微波的非常规磁振子激发

Unconventional magnon excitation by off-resonant microwaves

H. Y. Yuan, Shasha Zheng, Qiongyi He, Jiang Xiao, Rembert A. Duine

摘要:

人们普遍认为,物理系统只有在驱动频率与系统的正常模式频率相匹配时才能对周期性驱动做出显著响应,这导致共振。非共振现象很少被考虑,因为很难实现物理系统和非共振波之间的强耦合。在这里,我们研究了磁系统的响应压缩光,并令人惊讶地发现,最大限度地激发时,有效的驱动频率是几个数量级大于共振频率的磁振子。产生的磁振子被压缩,这带来了通过外部磁场可调谐压缩的优点。此外,我们还证明了这种非共振准粒子激发在所有存在玻色子相干参变相互作用的混合系统中是普遍存在的,它是一种纯粹的量子效应,根源于压缩真空中粒子的量子涨落.我们的发现可能为研究非共振现象提供了一条非常规的途径,并可能进一步有利于混合物质-光系统在连续变量量子信息中的应用。

英文摘要:

It is widely recognized that a physical system can only respond to a periodic driving significantly when the driving frequency matches the normal mode frequency of the system, which leads to resonance. Off-resonant phenomena are rarely considered because of the difficulty to realize strong coupling between physical systems and off-resonant waves. Here we examine the response of a magnetic system to squeezed light and surprisingly find that the magnons are maximally excited when the effective driving frequency is several orders of magnitude larger than the resonant frequency. The generated magnons are squeezed which brings the advantage of tunable squeezing through an external magnetic field. Furthermore, we demonstrate that such off-resonant quasi-particle excitation is universal in all the hybrid systems in which the coherent and parametric interaction of bosons exists and that it is purely a quantum effect, which is rooted in the quantum fluctuations of particles in the squeezed vacuum. Our findings may provide an unconventional route to study off-resonant phenomena and may further benefit the use of hybrid matter-light systems in continuous variable quantum information.

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