Dear Jibiao Li, A field of 1 Ry a.u. is giant and atypical, so one should not be surprised do not converge. Recall, 1 in Ry a.u.=36.3609*10^10 V/m.
I also noticed that you impose fixed occupations and then apply Gaussian smearing. Those are in contradiction of each other. Apparently the code enforces fixed occupations and ignores the smearing. Mostafa AUC, New Cairo, Egypt
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