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Title: Polaron dynamics with a multitude of Davydov D2 trial states
Authors: Zhou, Nengji
Huang, Zhongkai
Zhu, Jiangfeng
Chernyak, Vladimir
Zhao, Yang
Keywords: Phonons
Wave functions
Absorption spectra
Lagrangian mechanics
Issue Date: 2015
Source: Zhou, N., Huang, Z., Zhu, J., Chernyak, V., & Zhao, Y. (2015). Polaron dynamics with a multitude of Davydov D2 trial states. The Journal of Chemical Physics, 143(1), 014113-.
Series/Report no.: The Journal of Chemical Physics
Abstract: We propose an extension to the Davydov D2 Ansatz in the dynamics study of the Holstein molecular crystal model with diagonal and off-diagonal exciton-phonon coupling using the Dirac-Frenkel time-dependent variational principle. The new trial state by the name of the “multi-D2 Ansatz” is a linear combination of Davydov D2 trial states, and its validity is carefully examined by quantifying how faithfully it follows the Schrödinger equation. Considerable improvements in accuracy have been demonstrated in comparison with the usual Davydov trial states, i.e., the single D1 and D2 Ansätze. With an increase in the number of the Davydov D2 trial states in the multi-D2 Ansatz, deviation from the exact Schrödinger dynamics is gradually diminished, leading to a numerically exact solution to the Schrödinger equation.
DOI: 10.1063/1.4923009
Schools: School of Materials Science & Engineering 
Rights: © 2015 American Institute of Physics (AIP). This paper was published in The Journal of Chemical Physics and is made available as an electronic reprint (preprint) with permission of American Institute of Physics (AIP). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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