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• W3100794293 abstract "Methods of quantum nuclear wave-function dynamics have become very efficient in simulating large isolated systems using the time-dependent variational principle (TDVP). However, a straightforward extension of the TDVP to the density matrix framework gives rise to methods that do not conserve the energy in the isolated system limit and the total system population for open systems where only energy exchange with the environment is allowed. These problems arise when the system density is in a mixed state and is simulated using an incomplete basis. Thus, the basis set incompleteness, which is inevitable in practical calculations, creates artificial channels for energy and population dissipation. To overcome this unphysical behavior, we have introduced a constrained Lagrangian formulation of TDVP applied to the non-stochastic open system Schrodinger equation (NOSSE) [L. Joubert-Doriol, I. G. Ryabinkin, and A. F. Izmaylov, J. Chem. Phys. 141, 234112 (2014)]. While our formulation can be applied to any variational ansatz for the system density matrix, derivation of working equations and numerical assessment are done within the variational multiconfiguration Gaussian approach for a two-dimensional linear vibronic coupling model system interacting with a harmonic bath." @default.
• W3100794293 created "2020-11-23" @default.
• W3100794293 creator A5052396114 @default.
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• W3100794293 date "2015-04-03" @default.
• W3100794293 modified "2023-10-01" @default.
• W3100794293 title "Problem-free time-dependent variational principle for open quantum systems" @default.
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• W3100794293 doi "https://doi.org/10.1063/1.4916384" @default.
• W3100794293 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25854228" @default.
• W3100794293 hasPublicationYear "2015" @default.
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