Thermostating extended Lagrangian Born-Oppenheimer molecular dynamics
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Here, Extended Lagrangian Born-Oppenheimer molecular dynamics is developed and analyzed for applications in canonical (NVT) simulations. Three different approaches are considered: the Nosé and Andersen thermostats and Langevin dynamics. We have tested the temperature distribution under different conditions of self-consistent field (SCF) convergence and time step and compared the results to analytical predictions. We find that the simulations based on the extended Lagrangian Born-Oppenheimer framework provide accurate canonical distributions even under approximate SCF convergence, often requiring only a single diagonalization per time step, whereas regular Born-Oppenheimer formulations exhibit unphysical fluctuations unless a sufficiently high degree of convergence is reached at each time step. Lastly, the thermostated extended Lagrangian framework thus offers an accurate approach to sample processes in the canonical ensemble at a fraction of the computational cost of regular Born-Oppenheimer molecular dynamics simulations.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Laboratory Directed Research and Development (LDRD); USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1422959
- Report Number(s):
- LA-UR--14-29698
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 15 Vol. 142; ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Examining the chemical and structural properties that influence the sensitivity of energetic nitrate esters
|
journal | January 2018 |
Next generation extended Lagrangian first principles molecular dynamics
|
journal | August 2017 |
Parallel replica dynamics simulations of reactions in shock compressed liquid benzene
|
journal | June 2019 |
Canonical-ensemble extended Lagrangian Born–Oppenheimer molecular dynamics for the linear scaling density functional theory
|
journal | September 2017 |
Shock physics at the nanoscale [Invited]
|
journal | January 2018 |
Similar Records
Shadow energy functionals and potentials in Born–Oppenheimer molecular dynamics