Localization phenomena in models of ion-conducting glass formers |
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| Authors: | J?Horbach T?Voigtmann F?H?fling T?Franosch |
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| Institution: | 1.Institut für Materialphysik im Weltraum,K?ln,Germany;2.Zukunftskolleg und Fachbereich Physik, Universit?t Konstanz,Konstanz,Germany;3.Rudolf Peierls Centre for Theoretical Physics,Oxford,UK;4.Max-Planck-Institut für Metallforschung,Stuttgart,Germany;5.Institut für Theoretische Physik, Universit?t Erlangen-Nürnberg,Erlangen,Germany;6.Arnold Sommerfeld Center for Theoretical Physics (ASC) and Center for NanoScience (CeNS) Fakult?t für Physik, Ludwig-Maximilians-Universit?t München,München,Germany;7.Institut für Theoretische und Angewandte Physik, Universit?t Stuttgart,Stuttgart,Germany |
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| Abstract: | The mass transport in soft-sphere mixtures of small and big particles as well as in the disordered Lorentz gas (LG) model
is studied using molecular dynamics (MD) computer simulations. The soft-sphere mixture shows anomalous small-particle diffusion
signifying a localization transition separate from the big-particle glass transition. Switching off small-particle excluded
volume constraints slows down the small-particle dynamics, as indicated by incoherent intermediate scattering functions. A
comparison of logarithmic time derivatives of the mean-squared displacements reveals qualitative similarities between the
localization transition in the soft-sphere mixture and its counterpart in the LG. Nevertheless, qualitative differences emphasize
the need for further research elucidating the connection between both models. |
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