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Abstract:
Employing state-of-the-art first principles calculations, we show that hybrid laser pulses combining linearly and circularly polarized light allow for the excitation of free carriers of chosen spin at the arbitrary k-vector with the Brillouin zone of WSe2. The linear terahertz linear component of the pulse induces adiabatic intra-band evolution, serving to link an arbitrary point k0 to one of the high symmetry K points over a single pulse cycle. The circularly polarized component induces interband transitions at one of the two inequivalent K points that, due to the linear pulse, results at full cycle in laser excited charges at the desired k-vector k0 and not at the high symmetry K point. We, thus, theoretically predict a generalized form of the spin-valley locking in dichalcogenides, opening the way to the preparation of arbitrary momenta and spin specified excited states at ultrafast time scales.
