192 citations · 637 across the 14 of their papers we have counts for
11 papers · 1 filter
Stochastic level-set method for shape optimisation
Lester O. Hedges, H. Alicia Kim, Robert L. Jack
We present a new method for stochastic shape optimisation of engineering structures. The method generalises an existing deterministic scheme, in which the structure is represented…
Self-assembly at a nonequilibrium critical point
Stephen Whitelam, Lester O. Hedges, Jeremy D. Schmit
We use analytic theory and computer simulation to study patterns formed during the growth of two-component assemblies in 2D and 3D. We show that these patterns undergo a nonequilib…
Patterning a surface so as to speed nucleation from solution
Lester O. Hedges, Stephen Whitelam
Motivated by the question of how to pattern a surface in order to best speed nucleation from solution, we build on the work of Page and Sear [Phys. Rev. Lett. 97, 65701 (2006)] and…
Self-assembly of multicomponent structures in and out of equilibrium
Stephen Whitelam, Rebecca Schulman, Lester Hedges
Theories of phase change and self-assembly often invoke the idea of a `quasiequilibrium', a regime in which the nonequilibrium association of building blocks results nonetheless in…
Preparation and relaxation of very stable glassy states of a simulated liquid
Robert L. Jack, Lester O. Hedges, Juan P. Garrahan +1
We prepare metastable glassy states in a model glass-former made of Lennard-Jones particles by sampling biased ensembles of trajectories with low dynamical activity. These trajecto…
Excitations are localized and relaxation is hierarchical in glass-forming liquids
Aaron S. Keys, Lester O. Hedges, Juan P. Garrahan +2
For several atomistic models of glass formers, at conditions below their glassy dynamics onset temperatures, , we use importance sampling of trajectory space to stu…
Limit of validity of Ostwald's rule of stages in a statistical mechanical model of crystallization
Lester O. Hedges, Stephen Whitelam
We have only rules of thumb with which to predict how a material will crystallize, chief among which is Ostwald's rule of stages. It states that the first phase to appear upon tran…
De-coupling of Exchange and Persistence Times in Atomistic Models of Glass Formers
Lester O. Hedges, Lutz Maibaum, David Chandler +1
With molecular dynamics simulations of a fluid mixture of classical particles interacting with pair-wise additive Weeks-Chandler-Andersen potentials, we consider the time series of…
Dynamic facilitation explains democratic particle motion of metabasin transitions
Lester O. Hedges, Juan P. Garrahan
Transitions between metabasins in supercooled liquids seem to occur through rapid "democratic" collective particle rearrangements. Here we show that this apparent homogeneous parti…
Dynamic propensity in a kinetically constrained lattice gas
Lester O. Hedges, Juan P. Garrahan
We apply the concept of dynamic propensity to a simple kinetically constrained model of glass formers, the two-vacancy assisted triangular lattice gas, or (2)-TLG. We find that the…
Fast Simulation of Facilitated Spin Models
Douglas J. Ashton, Lester O. Hedges, Juan P. Garrahan
We show how to apply the absorbing Markov chain Monte Carlo algorithm of Novotny to simulate kinetically constrained models of glasses. We consider in detail one-spin facilitated m…