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Journal Article

Ultrafast optical control over spin and momentum in solids

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Dewhurst,  J. K.       
Max Planck Institute of Microstructure Physics, Max Planck Society;

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https://doi.org/10.1063/5.0076198
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2012.03247.pdf
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Citation

Shallcross, S., Li, Q. Z., Dewhurst, J. K., Sharma, S., & Elliott, P. (2022). Ultrafast optical control over spin and momentum in solids. Applied Physics Letters, 120(3): 032403. doi:10.1063/5.0076198.


Cite as: https://hdl.handle.net/21.11116/0000-000A-0D81-6
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.