Viscous Flow and Jump Dynamics in Molecular Supercooled Liquids: II Rotations

TL;DR

This study uses molecular dynamics simulations to analyze rotational jumps and dynamics in supercooled molecular liquids, revealing temperature-dependent behaviors and decoupling from viscosity.

Contribution

It provides new insights into the rotational jump mechanisms and their statistical properties in supercooled liquids through numerical simulations.

Findings

Rotational jumps follow a truncated power-law waiting-time distribution.

At lower temperatures, rotational correlation times decouple from viscosity.

Rotational dynamics exhibit temperature-dependent behavior.

Abstract

The rotational dynamics of a supercooled molecular liquid is investigated by a molecular-dynamics numerical study. We detect rotational jumps with a waiting-time distribution which is well fitted by a truncated power law. At lower temperatures the rotational correlation times are decoupled from the viscosity.