In this scheme, the system is weakly coupled to a heat bath with some temperature. The thermostat suppresses fluctuations of the kinetic energy of the system and therefore cannot produce trajectories consistent with the canonical ensemble. The temperature of the system is corrected such that the deviation exponentially decays with some time constant .
Though the thermostat does not generate a correct canonical ensemble (especially for small systems), for large systems on the order of hundreds or thousands of atoms/molecules, the approximation yields roughly correct results for most calculated properties. The scheme is widely used due to the efficiency with which it relaxes a system to some target (bath) temperature. In many instances, systems are initially equilibrated using the Berendsen scheme, while properties are calculated using the widely known Nosé-Hoover thermostat, which correctly generates trajectories consistent with a canonical ensemble.
- Berendsen, H. J. C.; Postma, J. P. M.; van Gunsteren, W. F.; DiNola, A.; Haak, J. R. (1984). "Molecular-Dynamics with Coupling to an External Bath". Journal of Chemical Physics. 81 (8): 3684–3690. Bibcode:1984JChPh..81.3684B. doi:10.1063/1.448118.
- Morishita, T. (2000). "Fluctuation formulas in molecular-dynamics simulations with the weak coupling heat bath". The Journal of Chemical Physics. 113: 2976–2982. Bibcode:2000JChPh.113.2976M. doi:10.1063/1.1287333.
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