A neural operator-conditioned diffusion model reconstructs ocean surface states with high-wavenumber fidelity from 99% to 99.9% sparse observations, outperforming standard UNET and FNO baselines.
Broadband Brillouin scattering study of ferroelectric instability of barium sodium niobate
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abstract
The barium sodium niobate (BNN) with tungsten-bronze structure is one of well-known optical crystals for electro-optic and nonlinear optic applications. This paper reviews the ferroelectric instability of BNN crystals. BNN is a uniaxial ferroelectric with a spontaneous polarization along the tetragonal $c$-axis. There is no report on the observation of an optical soft mode responsible for a ferroelectric phase transition. In the vicinity of the Curie temperature, $T_{\text{C}}=560${\deg}C, an intense central peak (CP) related to the polarization fluctuations along the $c$-axis was observed by the broadband Brillouin scattering experiment. The relaxation time determined by the CP width shows the critical slowing down towards $T_{\text{C}}$. This fact indicates that the ferroelectric instability of BNN is an order-disorder type.
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Generative Lagrangian data assimilation for ocean dynamics under extreme sparsity
A neural operator-conditioned diffusion model reconstructs ocean surface states with high-wavenumber fidelity from 99% to 99.9% sparse observations, outperforming standard UNET and FNO baselines.