The information provided might not be enough to fully diagnose the issue. Could you share the MATLAB code you’re using to model the GaN HEMT? This would help identify any potential issues with the implementation.
Additionally, how is the simulation set up in Silvaco? Are there specific settings or assumptions that differ from MATLAB?
One possible issue could be related to the gate width. If it's not explicitly defined in Silvaco, it might use a default value. You may need to adjust for this in MATLAB or account for it in your current calculations.
