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WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202301126
关键词
2D materials; nonlinear optics; second harmonic generation (SHG); Ttransition metal dichalcogenides (TMDs); valleytronics
With conventional electronics reaching its limits, all-optical processes are becoming more attractive for high speed and low power consumption devices. Valleytronics in atomically thin semiconductors is a promising approach, where light-matter interaction allows for efficient manipulation of binary information in energetically degenerate but non-equivalent valleys.
With conventional electronics reaching performance and size boundaries, all-optical processes have emerged as ideal building blocks for high speed and low power consumption devices. A promising approach in this direction is provided by valleytronics in atomically thin semiconductors, where light-matter interaction allows to write, store, and read binary information into the two energetically degenerate but non-equivalent valleys. Here, nonlinear valleytronics in monolayer WSe2 is investigated and show that an individual ultrashort pulse with a photon energy tuned to half of the optical band-gap can be used to simultaneously excite (by coherent optical Stark shift) and detect (by a rotation in the polarization of the emitted second harmonic) the valley population.
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