Total energy Conservation in metadynamics

[Ata Roudgar]

Dear all,

I am performing metadynamics using the extended Lagrangian. I notice
that I have drift on total energy about 0.08a.u. per 30ps towards the
more negative value of energy. I am wondering if this is a consequence
of choosing a large time step or there is something else. My time step
is 0.3 but I have relatively a large LAMBDA=0.6.

Thank you very much
Ata