Dear Siesta users


I have used Transiesta to study a graphene based transistor. I want to
calculate the gate-bias modulation effect on this structure. When I set the
external electric field perpendicular to the Z-direction along with
source-drain bias (TS.Voltage), I always get such warning:

 WARNING: both ext. voltage and field !!

 WARNING: will neglect voltage !!



It will be very kind of you if can help me.



Best regards,

Nayereh Ghobadi

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