  The highly efficient, easy-to-implement, long-ranged and non-destructive way
to realize active pumping has been still a great challenge. Here, using
molecular dynamics simulations, terahertz electromagnetic wave (TEW) is firstly
employed to stimulate an active pump for water transportation by biasedly
irradiated in a (6,6) single-walled carbon nanotube (SWCNT) under no external
pressure gradient. It is found that an ultrafast conductivity (up to 9.5 /ns)
through the pump around a characteristic frequency of 14 THz. The excellent
pumping ability is attributed to the resonance coupling between the TEW and
water molecules, in which water molecules can gain considerable energy
continuously to break the binding of hydrogen bonds and the spatial symmetry.
This proposed TEW-driven pump concept will offer a guide in polar molecule
transport through artificial or biological nanochannels, particularly in a
controllable, non-contact and large-scale process.
