Ultrafast valley-selective coherent optical manipulation with excitons in WSe2 and MoS2 monolayers
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Date
2023-03-25
Authors
Slobodeniuk, Artur
Koutenský, Petr
Bartoš, Miroslav
Trojánek, František
Malý, Petr
Novotný, Tomáš
Kozák, Martin
ORCID
0000-0002-5923-0260Advisor
Referee
Mark
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Publisher
Springer Nature
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Abstract
Increasing the speed limits of conventional electronics requires innovative approaches to manipulate other quantum properties of electrons besides their charge. An alternative approach utilizes the valley degree of freedom in low-dimensional semiconductors. Here we demonstrate that the valley degeneracy of exciton energies in transition metal dichalcogenide monolayers may be lifted by coherent optical interactions on timescales corresponding to few tens of femtoseconds. The optical Stark and Bloch-Siegert effects generated by strong nonresonant circularly-polarized light induce valley-selective blue shifts of exciton quantum levels by more than 30 meV. We show these phenomena by studying the two most intensive exciton resonances in transiton metal dichalcogenide monolayers and compare the results to a theoretical model, which properly includes the Coulomb interaction and exciton dispersion. These results open the door for ultrafast valleytronics working at multiterahertz frequencies.
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Citation
npj 2D Materials and Applications. 2023, vol. 7, issue 1, p. 1-7.
https://www.nature.com/articles/s41699-023-00385-1
https://www.nature.com/articles/s41699-023-00385-1
Document type
Peer-reviewed
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en