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- W2007168516 abstract "We present a rigorous Green-Kubo methodology for calculating transport coefficients based on on-the-fly estimates of: (a) statistical stationarity of the relevant process, and (b) error in the resulting coefficient. The methodology uses time samples efficiently across an ensemble of parallel replicas to yield accurate estimates, which is particularly useful for estimating the thermal conductivity of semi-conductors near their Debye temperatures where the characteristic decay times of the heat flux correlation functions are large. Employing and extending the error analysis of Zwanzig and Ailawadi [Phys. Rev. 182, 280 (1969)]10.1103/PhysRev.182.280 and Frenkel [in Proceedings of the International School of Physics “Enrico Fermi”, Course LXXV (North-Holland Publishing Company, Amsterdam, 1980)] to the integral of correlation, we are able to provide tight theoretical bounds for the error in the estimate of the transport coefficient. To demonstrate the performance of the method, four test cases of increasing computational cost and complexity are presented: the viscosity of Ar and water, and the thermal conductivity of Si and GaN. In addition to producing accurate estimates of the transport coefficients for these materials, this work demonstrates precise agreement of the computed variances in the estimates of the correlation and the transport coefficient with the extended theory based on the assumption that fluctuations follow a Gaussian process. The proposed algorithm in conjunction with the extended theory enables the calculation of transport coefficients with the Green-Kubo method accurately and efficiently." @default.
- W2007168516 created "2016-06-24" @default.
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- W2007168516 date "2012-04-21" @default.
- W2007168516 modified "2023-09-27" @default.
- W2007168516 title "Adaptive Green-Kubo estimates of transport coefficients from molecular dynamics based on robust error analysis" @default.
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- W2007168516 doi "https://doi.org/10.1063/1.3700344" @default.
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