The system is harder to converge at positive bias. You can not expect the converge to behave symmetric about 0V.
You should check how the convergence is, try to increase the number of points on the non-equilibrium contour to increase accuracy. You could also start by adding a larger imaginary part and then later decrease it while increasing the number of points on the non-equilibrium contour. Kind regards Nick 2013/10/30 Alen H <[email protected]> > Hi all, > I have a sequence of positive and negative bias applied on a system, for > the negative bias( -1.6V) it took 25 steps for transiesta to converge but > for the positive bias (1.6 V) it exceeds 100 steps without converging. > > Any one knows the reason? > > Regards, > Alen >
