BS solving three-dimensional (3-D) Poisson and Schrodinger equations,
we have shown that the formation of quantum dots are not very likely i
n the dual-gate Si transistor recently processed, The observed oscilla
tions in the transconductance versus upper and lower gate voltages can
be understood as elastic quantum ballistic transport from the source
to the drain through the conducting channel, The importance of the fri
nging electric field effect and the quantum transport characteristics
are to be emphasized in investigation and design of small size electro
nic devices.