Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2001-11-02
Physics
Condensed Matter
Soft Condensed Matter
11 pages and 4 figures. Submitted to Phys. Rev. Lett
Scientific paper
Orientational relaxation (OR) in a viscous, glassy liquid is investigated by carrying out extensive NPT molecular dynamics simulations of isolated ellipsoids in a glass forming binary mixture. Near the glass transition, the OR occurs mainly via hopping involving either a ring- or a tunnel like motion, with the participation of several neighboring atoms. In the glassy state, hopping is found to be accompanied by larger fluctuations in the total energy and the volume of the system. Both orientational and translational hopping are found to be {\it gated}, restricted primarily by the entropic bottlenecks, with orientation becoming increasingly slower than translation as the pressure is increased. OR is heterogeneous, with a wide distribution of decay times.
Bagchi Bhaskar
Bhattacharyya Sudip
Mukherjee Antara
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