Effects of random pinning on the potential energy landscape of a supercooled liquid.


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Authors
Niblett, SP 
de Souza, VK 
Jack, RL 
Wales, DJ 
Abstract

We use energy landscape methods to investigate the response of a supercooled liquid to random pinning. We classify the structural similarity of different energy minima using a measure of overlap. This analysis reveals a correspondence between distinct particle packings (which are characterised via the overlap) and funnels on the energy landscape (which are characterised via disconnectivity graphs). As the number of pinned particles is increased, we find a crossover from glassy behavior at low pinning to a structure-seeking landscape at high pinning, in which all thermally accessible minima are structurally similar. We discuss the consequences of these results for theories of randomly pinned liquids. We also investigate how the energy landscape depends on the fraction of pinned particles, including the degree of frustration and the evolution of distinct packings as the number of pinned particles is reduced.

Description
Keywords
cond-mat.stat-mech, cond-mat.stat-mech
Journal Title
J Chem Phys
Conference Name
Journal ISSN
0021-9606
1089-7690
Volume Title
149
Publisher
AIP Publishing
Sponsorship
Engineering and Physical Sciences Research Council (EP/N035003/1)
epsrc