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Interlayer exciton mediated second harmonic generation in bilayer MoS2статья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Shree Shivangi, Lagarde Delphine, Lombez Laurent, Robert Cedric, Balocchi Andrea, Watanabe Kenji, Taniguchi Takashi, Marie Xavier, Gerber Iann C., Glazov Mikhail M., Golub Leonid E., Urbaszek Bernhard, Paradisanos Ioannis
- Журнал: Nature communications
- Том: 12
- Номер: 1
- Год издания: 2021
- Издательство: Nature Pub. Group
- Местоположение издательства: United Kingdom
- Первая страница: 1
- Последняя страница: 8
- DOI: 10.1038/s41467-021-27213-8
- Аннотация: Second-harmonic generation (SHG) is a non-linear optical process, where two photons coherently combine into one photon of twice their energy. Efficient SHG occurs for crystals with broken inversion symmetry, such as transition metal dichalcogenide monolayers. Here we show tuning of non-linear optical processes in an inversion symmetric crystal. This tunability is based on the unique properties of bilayer MoS2, that shows strong optical oscillator strength for the intra- but also interlayer exciton resonances. As we tune the SHG signal onto these resonances by varying the laser energy, the SHG amplitude is enhanced by several orders of magnitude. In the resonant case the bilayer SHG signal reaches amplitudes comparable to the off-resonant signal from a monolayer. In applied electric fields the interlayer exciton energies can be tuned due to their in-built electric dipole via the Stark effect. As a result the interlayer exciton degeneracy is lifted and the bilayer SHG response is further enhanced by an additional two orders of magnitude, well reproduced by our model calculations. Since interlayer exciton transitions are highly tunable also by choosing twist angle and material combination our results open up new approaches for designing the SHG response of layered materials.
- Добавил в систему: Глазов Михаил Михайлович