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Cloaking the magnons

机译：掩盖魔农

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摘要

We propose two approaches to cloak the spin waves (magnons) by investigating magnetization dynamics. One approach is based on a spatially inhomogeneous anisotropic magnetic moment tensor. The other mechanism is using a spatially inhomogeneous anisotropic gyromagnetic factor tensor and an inhomogeneous external magnetic field. For both approaches, the damping tensor is also inhomogeneous and anisotropic. The magnetic characteristic functions of the magnetic materials have been theoretically derived for both mechanisms. A nonmagnetic core, which prevents magnons from entering and consequently distorts the spin-wave propagation, can be cloaked by a structured magnetic shell to redirect the spin wave around the core using the above design mechanisms. We discuss the feasibility of the proposed mechanisms in an ensemble of quantum dot molecules and magnetic semiconductors. The proposed approaches shed light on transformation magnonics, and can be utilized for future spin-wave lenses, concentrators, low backscattering waveguides, and ultimately quantum computing.
机译：我们提出了两种方法来通过研究磁化动力学来掩盖自旋波（磁振子）。一种方法是基于空间不均匀的各向异性磁矩张量。另一种机制是使用空间非均匀各向异性的回旋磁因子张量和非均匀外部磁场。对于这两种方法，阻尼张量都不均一且各向异性。理论上已经针对两种机理推导了磁性材料的磁特性函数。使用上述设计机制，可以用结构化的磁壳来掩盖防止磁振子进入并因此扭曲自旋波传播的非磁芯，从而使自旋波绕磁芯重定向。我们讨论了在量子点分子和磁性半导体集合中提出的机制的可行性。所提出的方法揭示了变换磁电机的原理，可用于未来的自旋波透镜，聚光器，低反向散射波导以及最终的量子计算。

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  • 来源
    《Physical review》 |2016年第10期|104418.1-104418.9|共9页
  • 作者

    Mehrdad Elyasi; Charanjit S. Bhatia; Cheng-Wei Qiu; Hyunsoo Yang;

  • 作者单位

    Department of Electrical and Computer Engineering, National University of Singapore, 117576 Singapore;

    Department of Electrical and Computer Engineering, National University of Singapore, 117576 Singapore;

    Department of Electrical and Computer Engineering, National University of Singapore, 117576 Singapore;

    Department of Electrical and Computer Engineering, National University of Singapore, 117576 Singapore;

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