Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2005-05-02
Physics
Condensed Matter
Disordered Systems and Neural Networks
11 pages, 5 figures, 1 table
Scientific paper
A unified treatment of structural relaxation in a deeply supercooled glassy liquid is developed which extends the existing mode coupling theory (MCT) by incorporating the effects of activated events by using the concepts from the random first order transition (RFOT) theory. We show how the decay of the dynamic structure factor is modified by localized activated events (called instantons) which lead to the spatial reorganization of molecules in the region where the instanton pops up. The instanton vertex added to the usual MCT depicts the probability and consequences of such an event which can be derived from the random first order transition theory. The vertex is proportional to $exp(-A/s_{c})$ where $s_{c}$ is the configurational entropy. Close to the glass transition temperature, $T_{g}$, since $s_{c}$ is diminishing, the activated process slows beyond the time window and this eventually leads to an arrest of the structural relaxation as expected for glasses. The combined treatment describes the dynamic structure factor in deeply supercooled liquid fairly well, with a hopping dominated decay following the MCT plateau.
Bagchi Biman
Bhattacharyya Sarika Maitra
Wolynes Peter G.
No associations
LandOfFree
Bridging the Gap Between the Mode Coupling and the Random First Order Transition Theories of Structural Relaxation in Liquids does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Bridging the Gap Between the Mode Coupling and the Random First Order Transition Theories of Structural Relaxation in Liquids, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bridging the Gap Between the Mode Coupling and the Random First Order Transition Theories of Structural Relaxation in Liquids will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-479447