INVESTIGADORES
FRECHERO marisa Alejandra
artículos
Título:
evolution of clusters of mobile particles in a model glass-former.
Autor/es:
APPIGNANESI G. A.; FRECHERO M. A.; MONTANI R. A
Revista:
PHYSICA A - STATISTICAL AND THEORETICAL PHYSICS
Referencias:
Año: 2003 vol. 329 p. 41 - 52
ISSN:
0378-4371
Resumen:
In this work we investigate by means of molecular dynamics simulations the detailed time
evolution of string-like cooperative motions in a binary LennardJones system at temperatures
close to its mode-coupling temperature, Tc. The strings will be fully geometrically and dynamically
characterised, making evident the correlated and concerted nature of the motions of the
particles comprised. We shall show that at low temperature each string occurs in a sharp time
window within the time interval [0; t∗], where t∗ is a characteristic time related to the lifetime
of the global clusters of mobile particles. Moreover, the di5erent strings that comprise a given
global cluster will be shown to take place independently and asynchronically, thus providing
further support to the heterogeneous scenario of relaxation, but in which di5erent independent
string-like sub-regions relax at di5erent timescales. Finally, we shall also demonstrate that as
temperature is increased the strings evolve during an increasing fraction of the time interval
[0; t*] and that for T =0:55 the lifetimes of the strings and of the global clusters become akin
to each other.Tc. The strings will be fully geometrically and dynamically
characterised, making evident the correlated and concerted nature of the motions of the
particles comprised. We shall show that at low temperature each string occurs in a sharp time
window within the time interval [0; t∗], where t∗ is a characteristic time related to the lifetime
of the global clusters of mobile particles. Moreover, the di5erent strings that comprise a given
global cluster will be shown to take place independently and asynchronically, thus providing
further support to the heterogeneous scenario of relaxation, but in which di5erent independent
string-like sub-regions relax at di5erent timescales. Finally, we shall also demonstrate that as
temperature is increased the strings evolve during an increasing fraction of the time interval
[0; t*] and that for T =0:55 the lifetimes of the strings and of the global clusters become akin
to each other.; t∗], where t∗ is a characteristic time related to the lifetime
of the global clusters of mobile particles. Moreover, the di5erent strings that comprise a given
global cluster will be shown to take place independently and asynchronically, thus providing
further support to the heterogeneous scenario of relaxation, but in which di5erent independent
string-like sub-regions relax at di5erent timescales. Finally, we shall also demonstrate that as
temperature is increased the strings evolve during an increasing fraction of the time interval
[0; t*] and that for T =0:55 the lifetimes of the strings and of the global clusters become akin
to each other.; t*] and that for T =0:55 the lifetimes of the strings and of the global clusters become akin
to each other.