[DFTB-Plus-User] how to use planar gate?

[Xiaobao]

Dear DFTB users,
I have some questions about planar gate:
Does it mean we have two gates, bottom and top gate? The GatePotential is the one we apply to top gate and as a default the bottom gate connect to ground?
Is there any way I can set an insulator between two gates?
Thanks,
Best,
xiaobao, 
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