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arXiv 1302.2215nlin.PS
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二维电晶格中的非线性局域模

Nonlinear localized modes in two-dimensional electrical lattices

L. Q. English, F. Palmero, J. F. Stormes, J. Cuevas, R. Carretero-González, P. G. Kevrekidis

摘要:

我们报道了在非线性电晶格的背景下,在两个空间维度上的能量自发局域化的观察。实验和理论上在一个由6 × 6单元组成的二维正方形和蜂窝晶格中产生了稳态和行波自局域模。具体而言,我们发现在驱动电压和频率的区域,其中固定的离散呼吸,也被称为固有的本地化模式(ILM),存在和稳定的阻尼和空间均匀的驱动的相互作用。通过将额外的电容器引入到单位单元中,这些晶格可以可控地诱导行进的离散呼吸子。当在晶格中实验性地产生多于一个这样的ILM时,非线性、离散性和波相互作用的相互作用产生复杂的动力学,其中ILM试图保持彼此之间的最小距离。数值模拟显示出良好的协议与实验结果,并确认这些现象定性结转到更大的晶格尺寸。

英文摘要:

We report the observation of spontaneous localization of energy in two spatial dimensions in the context of nonlinear electrical lattices. Both stationary and traveling self-localized modes were generated experimentally and theoretically in a family of two-dimensional square, as well as hon- eycomb lattices composed of 6x6 elements. Specifically, we find regions in driver voltage and frequency where stationary discrete breathers, also known as intrinsic localized modes (ILM), exist and are stable due to the interplay of damping and spatially homogeneous driving. By introduc- ing additional capacitors into the unit cell, these lattices can controllably induce traveling discrete breathers. When more than one such ILMs are experimentally generated in the lattice, the interplay of nonlinearity, discreteness and wave interactions generate a complex dynamics wherein the ILMs attempt to maintain a minimum distance between one another. Numerical simulations show good agreement with experimental results, and confirm that these phenomena qualitatively carry over to larger lattice sizes.

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