  We use a self-consistent method to study the current of the single molecular
transistor modulated by the transverse gate-bias in the level of the
first-principles calculations. The numerical results show that both the
polyacene-dithiol molecules and the fused-ring oligothiophene molecules are the
potential high-frequency molecular transistor controlled by the transverse
field. The long molecules of the polyacene-dithiol or the fused-ring thiophene
are in favor of realizing the gate-bias controlled molecular transistor. The
theoretical results suggest the related experiments.
