期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 126, 期 21, 页码 3950-3960出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.2c01782
关键词
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资金
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, CPIMS Program [DE-SC0021009]
- XSEDE84 [CHE180007P, CHE180027P]
- U.S. Department of Energy (DOE) [DE-SC0021009] Funding Source: U.S. Department of Energy (DOE)
This article introduces a physics-based machine learning method called SPIB for finding important entropy, energy, and enthalpy barriers in physical systems. Through analysis of different systems of varying complexity, SPIB demonstrates good predictive performance, aiding in the understanding and sampling of activated mechanisms.
When examining dynamics occurring at nonzero temperatures, both energy and entropy must be taken into account to describe activated barrier crossing events. Furthermore, good reaction coordinates need to be constructed to describe different metastable states and the transition mechanisms between them. Here we use a physics-based machine learning method called state predictive information bottleneck (SPIB) to find nonlinear reaction coordinates for three systems of varying complexity. SPIB is able to correctly predict an entropic bottleneck for an analytical flat-energy double-well system and identify the entropyand energy-dominated pathways for an analytical four-well system. Finally, for a simulation of benzoic acid permeation through a lipid bilayer, SPIB is able to discover the entropic and energetic barriers to the permeation process. Given these results, we thus establish that SPIB is a reasonable and robust method for finding the important entropy, energy, and enthalpy barriers in physical systems, which can then be used to enhance the understanding and sampling of different activated mechanisms.
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