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arXiv 2109.07671cond-mat.str-elcond-mat.other
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旋转磁振子与高阶旋扭Skyrmion模的强耦合

Strong Coupling between Propagating Magnons and High-order Gyrotropic Skyrmion Modes

Zhihua Liu, Kaile Xie, Fusheng Ma

摘要:

受近年来强磁振子-自旋织构-光子偶极耦合研究的启发,磁振子与自旋织构局域共振通过直接交换相互作用的耦合被人们所期待,但尚未实现。在这项工作中,我们证明了相干耦合之间的传播磁振子和本地skyrmion共振。在频域色散中除了观察到拉比耦合带隙(RCG)外,还观察到极化激元带隙的磁振子模拟,即极化声子带隙(PBG)。耦合的实现要求旋扭Skyrmion模不仅要满足大于1的量子数,而且要满足与磁振子相反的手征。可以控制所观察到的PBG和RCG存在于不同的布里渊区(BZ)以及在BZ边界。通过选择传播磁振子的波数,耦合强度可以接近强区。我们的研究结果为研究量子信息技术中的量子光学现象提供了一个纯磁振子平台。

英文摘要:

Inspired by the recent achievements of the strong magnons- and spin textures-photons coupling via dipolar interaction, the coupling between magnons and the local resonances of spin textures through direct exchange interaction is expected but not realized yet. In this work, we demonstrated the coherent coupling between propagating magnons and local skyrmion resonances. Besides the Rabbi coupling gap (RCG) in the frequency field dispersion, a magnonic analog of polariton gap, polaragnonic band gap (PBG), is also observed in the frequency-wavenumber dispersion. The realization of coupling requires the gyrotropic skyrmion modes to satisfy not only their quantum number larger than one but also their chirality opposite to that of magnons. The observed PBG and RCG can be controlled to exist within different Brillouin zones (BZs) as well as at BZ boundaries. The coupling strength can approach the strong regime by selecting the wavenumber of propagating magnons. Our findings could provide a pure magnonic platform for investigating quantum optics phenomena in quantum information technology.

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