AI 中文总结
研究非晶态固体机械损耗，通过分子模拟发现其跃迁具空间相关性和强相互作用，传统两能级系统叠加描述不适用，结合退火研究与主导弛豫路径分析，揭示降低室温机械损耗新机制。
AI 中文摘要
非晶态固体无序且富含缺陷的结构形成了异质的高维能量景观。这种能量景观可用稳定能量极小值之间跃迁的离散态网络来描述。在低频机械振荡下，缺陷介导的热激活跃迁是机械耗散的微观机制，是地基引力波探测器镜面涂层机械损耗的主要原因。通过分子模拟，发现空间相关且强相互作用的跃迁，需用一般网络描述而非传统假设的独立两能级系统叠加。退火研究结合能量景观中主导弛豫路径分析揭示了降低室温机械损耗的新机制。
英文摘要
The disordered and defect-rich structure of amorphous solids forms heterogeneous, high-dimensional energy landscapes. Such an energy landscape can be described by a discrete-state network of transitions between stable energy minima. Under low-frequency mechanical oscillations, defect-mediated, thermally activated transitions provide a microscopic mechanism for mechanical dissipation that are the dominant cause of mechanical loss in the mirror coatings of ground based gravitational waves detectors. Using molecular simulations, we find spatially correlated and strongly interacting transitions that require a general network description instead of a superposition of independent two-level systems as traditionally assumed. An annealing study combined with an analysis of dominant relaxation paths in the energy landscape reveals novel mechanisms for reducing room temperature mechanical loss.
