Temperature dependence of the transition packing fraction of thermal jamming in a harmonic soft sphere system

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Maiti M, Schmiedeberg M
Zeitschrift: Journal of Physics: Condensed Matter
Jahr der Veröffentlichung: 2019
Band: 31
ISSN: 0953-8984
eISSN: 1361-648X


Abstract

The glassy dynamics of soft harmonic spheres are often mapped onto the
dynamics of hard spheres by considering an effective diameter for the
soft particles and therefore an effective packing fraction. While in
this approach the thermal fluctuations within valleys of the energy
landscape are covered, the crossing of energy barriers from one valley
into another usually is neglected. Here we argue—motivated by studies of
the glass transition based on explorations of the energy landscape—that
the crossing of energy barriers can be attributed by an effective
decrease of the glass transition packing fraction with increasing
temperature T according to T 0.2. Furthermore,
we reanalyzing data of soft sphere simulations. Since fitting scaling
laws to simulation data always allows for some arbitrariness, we cannot
prove based on the simulation data that our idea of a shift of the glass
transition packing fraction due to barrier crossings is the only
possible way to explain the discrepancies that have been observed
previously. However, we show that a possible explanation of the
simulation data is given by our approach to characterize the dynamics of
soft spheres by both, the previously-considered temperature-dependent
effective packing fraction due to the increase of the mean overlap
between neighboring particles with stronger thermal fluctuations and the
newly introduced increase of the glass transition packing with an
increasing probability of barrier crossings.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Maiti, Moumita
Professur für Theoretische Physik
Schmiedeberg, Michael Prof. Dr.
Professur für Theoretische Physik


Zitierweisen

APA:
Maiti, M., & Schmiedeberg, M. (2019). Temperature dependence of the transition packing fraction of thermal jamming in a harmonic soft sphere system. Journal of Physics: Condensed Matter, 31. https://dx.doi.org/10.1088/1361-648X/ab01e9

MLA:
Maiti, Moumita, and Michael Schmiedeberg. "Temperature dependence of the transition packing fraction of thermal jamming in a harmonic soft sphere system." Journal of Physics: Condensed Matter 31 (2019).

BibTeX: 

Zuletzt aktualisiert 2019-22-02 um 13:50