Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: S1.00211 : Direct imaging of spatially and temporally heterogeneous two-state dynamics on metallic glass and amorphous silicon surfaces well below T$_{g}$
Author:
Probing glassy dynamics of atomic glass formers with atomic
resolution far below the glass transition has remained elusive
due to the long waiting times and the small length scales
involved. Here we report atomic resolution movies acquired using
time-lapse scanning tunneling microscopy on metallic glass and
amorphous silicon (a-Si) surfaces at room temperature well below
their respective glass transition temperatures (Tg of glasses
studied lie between 600-1000K). We find the clusters on metallic
glass surfaces with size 2-8 atomic spacings exhibit dynamics
which are almost exclusively two-state (P$_{3-state}\sim $0.06)
[1]. The two-state dynamics was found to be both spatially and
temporally heterogeneous. We attribute the two-state
dynamics to the secondary $\beta $ relaxations which remains
active well below the glass transition. Similar dynamics were
found on amorphous silicon surfaces providing the first evidence
for the existence of glass-like dynamics on pure a-Si surfaces at
non-cryogenic temperature.
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[1] S. Ashtekar et.al. J. Phys. Chem. Lett., 2010, 1 (13), pp
1941--1945
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.S1.211
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