Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-19937
Niklasson, A M N; Steneteg, P; Odell, A; Bock, N; Challacombe, M; Tymczak, C J; Holmstroem, E; Zheng, G; Weber, V (2009). Extended Lagrangian Born–Oppenheimer molecular dynamics with dissipation. Journal of Chemical Physics, 130(21):214109.
PDF (Verlags PDF)
- Registered users only
View at publisher
Stability and dissipation in the propagation of the electronic degrees of freedom in time-reversible extended Lagrangian Born-Oppenheimer molecular dynamics [Niklasson , Phys. Rev. Lett. 97, 123001 (2006); Phys. Rev. Lett. 100, 123004 (2008)] are analyzed. Because of the time-reversible propagation the dynamics of the extended electronic degrees of freedom is lossless with no dissipation of numerical errors. For long simulation times under ``noisy'' conditions, numerical errors may therefore accumulate to large fluctuations. We solve this problem by including a dissipative external electronic force that removes noise while keeping the energy stable. The approach corresponds to a Langevin-like dynamics for the electronic degrees of freedom with internal numerical error fluctuations and external, approximately energy conserving, dissipative forces. By tuning the dissipation to balance the numerical fluctuations the external perturbation can be kept to a minimum.
30 downloads since deposited on 31 Jul 2009
5 downloads since 12 months
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Department of Chemistry|
|Dewey Decimal Classification:||540 Chemistry|
|Deposited On:||31 Jul 2009 11:25|
|Last Modified:||05 Jun 2014 13:50|
|Publisher:||American Institute of Physics|
Users (please log in): suggest update or correction for this item
Repository Staff Only: item control page