TY - JOUR
T1 - Temperature-dependent two-state dynamics of individual cooperatively rearranging regions on a glass surface
AU - Ashtekar, S.
AU - Lyding, J.
AU - Gruebele, M.
PY - 2012/10/19
Y1 - 2012/10/19
N2 - Cooperatively rearranging regions (CRRs) play a central role in the temperature dependence of glass dynamics. We record real-time atomic resolution movies of individual CRRs, while ramping their temperature. Between 295 and 326 K, well below the bulk glass transition temperature T g, the rate coefficient for two-state hopping of CRRs increases over tenfold, yielding an Arrhenius activation barrier of ≈10k BT g. By time resolving the dynamics of many individual CRRs, we show that highly stretched dynamics of the CRR ensemble results mainly from spatial heterogeneity, less from temporal heterogeneity of individual CRRs.
AB - Cooperatively rearranging regions (CRRs) play a central role in the temperature dependence of glass dynamics. We record real-time atomic resolution movies of individual CRRs, while ramping their temperature. Between 295 and 326 K, well below the bulk glass transition temperature T g, the rate coefficient for two-state hopping of CRRs increases over tenfold, yielding an Arrhenius activation barrier of ≈10k BT g. By time resolving the dynamics of many individual CRRs, we show that highly stretched dynamics of the CRR ensemble results mainly from spatial heterogeneity, less from temporal heterogeneity of individual CRRs.
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U2 - 10.1103/PhysRevLett.109.166103
DO - 10.1103/PhysRevLett.109.166103
M3 - Article
C2 - 23215096
AN - SCOPUS:84867790168
SN - 0031-9007
VL - 109
JO - Physical review letters
JF - Physical review letters
IS - 16
M1 - 166103
ER -