Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2001-07-10
Phys. Rev. Lett. 88, 055502 (2002)
Physics
Condensed Matter
Disordered Systems and Neural Networks
Scientific paper
10.1103/PhysRevLett.88.055502
We numerically study the potential energy landscape of a fragile glassy system and find that the dynamic crossover corresponding to the glass transition is actually the effect of an underlying geometric transition caused by a qualitative change in the topological properties of the landscape. Furthermore, we show that the potential energy barriers connecting local glassy minima increase with decreasing energy of the minima, and we relate this behaviour to the fragility of the system. Finally, we analyze the real space structure of activated processes by studying the distribution of particle displacements for local minima connected by simple saddles.
Cavagna Andrea
Giardina Irene
Grigera Tomas S.
Parisi Giorgio
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