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arXiv 2406.04782cond-mat.dis-nncond-mat.stat-mechnlin.CDphysics.flu-dyn
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非线性对表面重力波安德森局域化的影响

Effects of nonlinearity on Anderson localization of surface gravity waves

Guillaume Ricard, Filip Novkoski, Eric Falcon

AI总结:

该研究针对非线性波安德森局域化程度变化的长期争议,通过全时空分辨测量和数值模拟,证实非线性增强表面重力波局域化并首次实验揭示二者依赖关系,还报道了无序度等的影响及布洛赫色散关系的宏观对应物证据。

摘要:

安德森局域化是线性波在无序介质中传播时发生的多重散射现象。该现象于20世纪50年代末在电子体系中被发现,后续已在冷原子以及经典波(光学、微波和声学)体系中通过实验观测到,但非线性波的局域化程度是会增强还是减弱,一直是长期存在的争议问题。本文研究表明,非线性会增强在底部随机的水渠中传播的表面重力波的局域化效应。我们还通过实验揭示了局域化长度如何依赖于非线性,这一关联此前从未在任何类型的波中被报道过。为实现上述研究,我们采用了全时空分辨波场测量技术以及数值模拟方法。本文还报道了无序程度和系统有限尺寸对局域化的影响。此外,我们还展示了首个实验证据,证明周期性水深条件下线性流体力学表面波存在布洛赫色散关系的宏观对应物。

英文摘要:

Anderson localization is a multiple-scattering phenomenon of linear waves propagating within a disordered medium. Discovered in the late 50s for electrons, it has since been observed experimentally with cold atoms and with classical waves (optics, microwaves, and acoustics), but whether wave localization is enhanced or weakened for nonlinear waves is a long-standing debate. Here, we show that the nonlinearity strengthens the localization of surface-gravity waves propagating in a canal with a random bottom. We also show experimentally how the localization length depends on the nonlinearity, which has never been reported previously with any type of wave. To do so, we use a full space-and-time-resolved wavefield measurement as well as numerical simulations. The effects of the disorder level and the system's finite size on localization are also reported. We also highlight the first experimental evidence of the macroscopic analog of Bloch's dispersion relation of linear hydrodynamic surface waves over periodic bathymetry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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