磁主动反馈环中复杂动力学斑图形成的物理实现
Physical realization of complex dynamical pattern formation in magnetic active feedback rings
摘要：
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-朗道物理的干净的实验。对于围绕基于有源磁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斑图形成：（1）周期呼吸;（2）复杂递归;（3）自发空间移位;和（4）不稳定性。这些非瞬态的，长寿命的行为中观察到的微波自旋波包络内的色散，非线性钇铁石榴石波导操作在一个环的几何形状，其中的净损耗直接通过线性放大补偿每个往返O（100 ns）循环。这些行为表现出从几十到几千个往返时间O（$μ$ s）的周期，并且对于1000 s的周期O（ms）是稳定的。我们提出了这些动力学行为的10个观测结果，这些观测结果跨越了实验可及的吸引力立方非线性，色散和外部场强的范围，这些范围支持在四波混合主导制度中自生成后向体积自旋波。三波分裂没有被明确禁止，被视为非线性损耗的额外来源。这些明亮的孤立波的长寿命行为中的每一个都是以前数值预测可观察到的。然而，在有吸引力的非线性暗孤波的动态斑图形成是完全新颖的，并报告了周期呼吸和复杂的复发行为。所有的行为都是在群速度同动框架中识别的。
英文摘要：
We report the clean experimental realization of cubic-quintic complex Ginzburg-Landau 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 microwave spin wave envelopes circulating within a dispersive, nonlinear yttrium iron garnet waveguide operating in a ring geometry where the net losses are directly compensated for via linear amplification on each round trip O(100 ns). The behaviors exhibit periods ranging from tens to thousands of round trip times O($μ$ s) and are stable for 1000s of periods O(ms). We present 10 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. Each of these long lifetime behaviors of bright solitary waves was previously numerically predicted to be observable. The dynamical pattern formation of dark solitary waves in attractive nonlinearity, however, is entirely novel and is reported for both the periodic breather and complex recurrence behaviors. All behaviors are identified in the group velocity co-moving frame.
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