Hi I trying to look at transient response of a device, similar to the InP UTC structure. The issue I’m having is that the solver initializes but it seems that no matter how small I make the minimum time step the first step does not converge. The transient BC is almost identical to that of the utc_ssac.ldev file (a -5V bias with a small ac voltage).
So basically even though the time step on the electrical contact is 5000 fs, the solver doesn’t converge after the first time step of as low as 10 fs.
Any input that would help me understand this would be appreciated.