Metadynamics

Efficient Exploration of Reactive Potential Energy Surfaces Using Car-Parrinello Molecular Dynamics

Physical Review Letters, 90(23):238302.
Marcella Iannuzzi, Alessandro Laio, and Michele Parrinello (2003)

Abstract

The possibility of observing chemical reactions in ab initio molecular dynamics runs is severely hindered by the short simulation time accessible. We propose a new method for accelerating the reaction process, based on the ideas of the extended Lagrangian and coarse-grained non-Markovian metadynamics. We demonstrate that by this method it is possible to simulate reactions involving complex atomic rearrangements and very large energy barriers in runs of a few picoseconds.

URL: http://dx.doi.org/10.1103/PhysRevLett.90.238302

Escaping free-energy minima

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 99(20):12562-12566.
A Laio and M Parrinello (2002)


Abstract

We introduce a powerful method for exploring the properties of the multidimensional free energy surfaces (FESs) of complex many-body systems by means of coarse-grained non-Markovian dynamics in the space defined by a few collective coordinates. A characteristic feature of these dynamics is the presence of a history-dependent potential term that, in time, fills the minima in the FES, allowing the efficient exploration and accurate determination of the FES as a function of the collective coordinates. We demonstrate the usefulness of this approach in the case of the dissociation of a NaCl molecule in water and in the study of the conformational changes of a dialanine in solution.


URL: http://dx.doi.org/10.1073/pnas.202427399