Fig. 2 (IMAGE)
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Schematic illustration of the action of hencomb pulse: (i) a half cycle of THz light drives an intraband motion sending states distant from the gap edge to the gap edge; (ii) the optical component excites states across the gap; (iii) finally the second half cycle of THz light returns the state to its original momentum. The overall action of the hencomb pulse is thus to excite charge at a finite valley momentum determined by the THz pulse polarization vector.
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