is channel length can influence the gate effect?

[njuxyh]

Hi all:

i have a question about the gate effect , my  metal layer thickness is increased to 13 angstrom, but when i add gate voltage to 13 V, the band gap was shift so small, so i am wondering whether the channel length 35 angstrom is too short? the channle length can influnece gate effect?

my two-probe system is attached, the Transmission spectrum at gate 0v and 13 v are also included,

is anyone can help to find the cause why the gate effect so small, my aim is to get a high off-on ration,

[Jess Wellendorff]

I do not know what should happen to the band gap when applying such strong electric gate fields, but the real-space thickness of the metal gate should not matter too much, as long as it is not excessively thin.