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Title: Improving Free-Energy Estimates from Unidirectional Work Measurements: Theory and Experiment
Author: Palassini, Matteo
Ritort Farran, Fèlix
Keywords: Física de partícules
Particle physics
Issue Date: 2-Aug-2011
Publisher: American Physical Society
Abstract: We derive analytical expressions for the bias of the Jarzynski free-energy estimator from N nonequilibrium work measurements, for a generic work distribution. To achieve this, we map the estimator onto the random energy model in a suitable scaling limit parametrized by ( log  N ) / μ , where μ measures the width of the lower tail of the work distribution, and then compute the finite- N corrections to this limit with different approaches for different regimes of ( log  N ) / μ . We show that these expressions describe accurately the bias for a wide class of work distributions and exploit them to build an improved free-energy estimator from unidirectional work measurements. We apply the method to optical tweezers unfolding and refolding experiments on DNA hairpins of varying loop size and dissipation, displaying both near-Gaussian and non-Gaussian work distributions.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2011, vol. 107, num. 6, p. 060601
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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