Using special semiconductor material made from layers of mercury telluride and cadmium telluride, the experimenters employed quantum tricks to align the spin of electrons like a parade of tops spinning together. Under these extraordinary conditions, the current flows only along the edges of the sheet of semiconductor. Interestingly, electrons with identical spins travel in the same direction together, while electrons with the opposite spin move in the opposite direction. Unlike existing semiconductors, this unusual electric current does not generate destructive heat through dissipation of power or the collision of electrons with impurities in the semiconducting material.
So there isn't your usual heat dissipation via Ohmic heating. This certainly is the next logical step in semiconductor physics.
And there are people who can't figure out the use of quantum mechanics? :)