De Francesco Alessio, Formisano Ferdinando, Scaccia Luisa, Guarini Eleonora, Bafile Ubaldo, Maccarini Marco, Nykypanchuck Dmytro, Suvorov Alexei, Cai Yong Q, Lynch Scott T, Cunsolo Alessandro
CNR-IOM & INSIDE@ILL c/o Operative Group in Grenoble (OGG), F-38042 Grenoble, France.
Institut Laue-Langevin (ILL), F-38042 Grenoble, France.
Nanomaterials (Basel). 2022 Jul 14;12(14):2401. doi: 10.3390/nano12142401.
One of the grand challenges of new generation Condensed Matter physicists is the development of novel devices enabling the control of sound propagation at terahertz frequency. Indeed, phonon excitations in this frequency window are the leading conveyor of heat transfer in insulators. Their manipulation is thus critical to implementing heat management based on the structural design. To explore the possibility of controlling the damping of sound waves, we used high spectral contrast Inelastic X-ray Scattering (IXS) to comparatively study terahertz acoustic damping in a dilute suspension of 50 nm nanospheres in glycerol and on pure glycerol. Bayesian inference-based modeling of measured spectra indicates that, at sufficiently large distances, the spectral contribution of collective modes in the glycerol suspension becomes barely detectable due to the enhanced damping, the weakening, and the slight softening of the dominant acoustic mode.
新一代凝聚态物理学家面临的重大挑战之一是开发能够控制太赫兹频率下声音传播的新型器件。事实上,在这个频率窗口中的声子激发是绝缘体中热传递的主要载体。因此,对它们的操控对于基于结构设计实现热管理至关重要。为了探索控制声波阻尼的可能性,我们使用高光谱对比度非弹性X射线散射(IXS)来比较研究甘油中50纳米纳米球的稀悬浮液和纯甘油中的太赫兹声阻尼。基于贝叶斯推断的测量光谱建模表明,在足够大的距离处,由于主导声模的阻尼增强、减弱和轻微软化,甘油悬浮液中集体模式的光谱贡献几乎无法检测到。