Collective dynamics in liquid lead. II. Mode contributions to time correlation functions

Area of Science:

• Condensed Matter Physics
• Materials Science
• Statistical Mechanics

Background:

• Understanding collective excitations is crucial for characterizing liquid dynamics.
• Density-density time correlation functions provide insights into atomic-level motion in liquids.

Purpose of the Study:

• To analyze the contributions of various collective excitations to the density-density time correlation function.
• To identify the dominant mode governing the correlation function in liquid lead.

Main Methods:

• Utilized the nine-variable approach of generalized collective modes.
• Investigated mode contributions to the density-density time correlation function.

Main Results:

• A kinetic relaxing mode, associated with slow density fluctuations, was identified.
• This mode was found to almost completely define the correlation function's shape near the static structure factor's main peak.

Conclusions:

• The kinetic relaxing mode is the primary driver of the density-density time correlation function's behavior in liquid lead.
• The study elucidates the physical significance of this dominant mode in liquid metal dynamics.