Laser light hybrids control giant currents at ultrafast times
Circularly polarized laser pulse (a-c) versus a hencomb laser pulse (d-f). The vector potential of a circularly polarized lightwave applied to the two dimensional material Tungsten Diselenide generates no residual current after the laser pulse (a,b), solely exciting a valley charge state, (c), in which the Bloch velocities of all excited states cancel by virtue of the charge excitation being positioned at the valley centre (the apex of the Brillouin zone indicated by the red lines). In contrast a hencomb pulse, in which…
