Physical realization of complex dynamical pattern formation in magnetic active feedback rings
Physical realization of complex dynamical pattern formation in magnetic active feedback rings
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DOI：
10.1088/1367-2630/ac47cb
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发表时间：
2020-03
影响因子：
3.3
通讯作者：
Justin Q. Anderson;P. Janantha;Diego A. Alcala;Mingzhong Wu;L. Carr
中科院分区：
文献类型：
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作者：
Justin Q. Anderson;P. Janantha;Diego A. Alcala;Mingzhong Wu;L. Carr
我们报告了在一个单一驱动的阻尼系统中实现的五阶复金斯堡-朗道（CQCGL）物理的干净的实验。对于围绕基于主动磁性薄膜的反馈环传播的亮孤波和暗孤波，确定了四种数值预测的复杂动力学行为和图案形成：（1）周期呼吸;（2）复杂复发;（3）自发空间移位;和（4）不稳定性。这些非瞬态的，长寿命的行为观察到在分散的，非线性的钇铁石榴石波导内循环的自生自旋波包络。波导以环形几何结构操作，其中在每个往返行程（100 ns的量级）上经由线性放大直接补偿净损耗。这些行为表现出从数十到数千个往返时间（μs量级）的周期，并且在1000 s的周期（ms量级）内是稳定的。我们提出了十个观察这些动力学行为的实验范围内有吸引力的立方非线性，色散和外部场强，支持自我生成的后向体自旋波在四波混合占主导地位的制度。三波分裂没有被明确禁止，被视为非线性损耗的额外来源。所有观察到的行为是强大的宽参数制度，使他们有希望的技术应用。我们提出了10个实验观测，涵盖了所有类别的动力学行为，以前理论上预测是可观察的。这是一个完整的实验验证的CQCGL方程作为一个模型的基本，复杂的非线性动力学的研究驱动，阻尼波在非线性，色散系统的发展。报道的动力学图案形成的自生暗孤波在吸引力的非线性没有外部源或潜力，但是，是完全新颖的，并提出了两个周期呼吸和复杂的复发行为。
We report the clean experimental realization of cubic–quintic complex Ginzburg–Landau (CQCGL) physics in a single driven, damped system. Four numerically predicted categories of complex dynamical behavior and pattern formation are identified for bright and dark solitary waves propagating around an active magnetic thin film-based feedback ring: (1) periodic breathing; (2) complex recurrence; (3) spontaneous spatial shifting; and (4) intermittency. These nontransient, long lifetime behaviors are observed in self-generated spin wave envelopes circulating within a dispersive, nonlinear yttrium iron garnet waveguide. The waveguide is operated in a ring geometry in which the net losses are directly compensated for via linear amplification on each round trip (of the order of 100 ns). These behaviors exhibit periods ranging from tens to thousands of round trip times (of the order of μs) and are stable for 1000s of periods (of the order of ms). We present ten observations of these dynamical behaviors which span the experimentally accessible ranges of attractive cubic nonlinearity, dispersion, and external field strength that support the self-generation of backward volume spin waves in a four-wave-mixing dominant regime. Three-wave splitting is not explicitly forbidden and is treated as an additional source of nonlinear losses. All observed behaviors are robust over wide parameter regimes, making them promising for technological applications. We present ten experimental observations which span all categories of dynamical behavior previously theoretically predicted to be observable. This represents a complete experimental verification of the CQCGL equation as a model for the study of fundamental, complex nonlinear dynamics for driven, damped waves evolving in nonlinear, dispersive systems. The reported dynamical pattern formation of self-generated dark solitary waves in attractive nonlinearity without external sources or potentials, however, is entirely novel and is presented for both the periodic breather and complex recurrence behaviors.