Dispersion of acoustic excitations in tetrahedral liquids

Abstract

Investigation of the longitudinal and transverse excitations in liquids is of great importance for understanding the fundamentals of the liquid state of matter. One of the important questions is the temperature and density dependence of the frequency of the excitations. In our recent works it was shown that while in simple liquids the frequency of longitudinal excitations increases when the temperature is increased isochorically, in water the frequency can anomalously decrease with the temperature increase. In the present manuscript we study the dispersion curves of longitudinal and transverse excitations of water and liquid silicon modelled by Stillinger-Weber potential. We show that both substances demonstrate the anomaly of the dispersion curves, but it the case of water it is more pronounced.

References in corpus (9)

• Configurational Entropy and Diffusivity of Supercooled Water
• Two liquid states of matter: A new dynamic line on a phase diagram
• "Liquid-gas" transition in the supercritical region: Fundamental changes in the particle dynamics
• Liquid-liquid critical point in supercooled silicon
• Static and Dynamic Properties of Stretched Water
• Emergence and evolution of $k$-gap in spectra of liquid and supercritical states
• Frenkel Line and Solubility Maximum in Supercritical Fluids
• The Rise and Fall of Anomalies in Tetrahedral Liquids
• How to quantify structural anomalies in fluids?

Cited by in corpus (1)

• Emergence of Debye scaling in the density of states of liquids under nanoconfinement