Probing Electronic States in Monolayer Semiconductors through Static and Transient Third-Harmonic Spectroscopies

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Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2022-01-20
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Mcode
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Language
en
Pages
Series
Advanced Materials
Abstract
Electronic states and their dynamics are of critical importance for electronic and optoelectronic applications. Here, various relevant electronic states in monolayer MoS2, such as multiple excitonic Rydberg states and free-particle energy bands are probed with a high relative contrast of up to >= 200 via broadband (from approximate to 1.79 to 3.10 eV) static third-harmonic spectroscopy (THS), which is further supported by theoretical calculations. Moreover, transient THS is introduced to demonstrate that third-harmonic generation can be all-optically modulated with a modulation depth exceeding approximate to 94% at approximate to 2.18 eV, providing direct evidence of dominant carrier relaxation processes associated with carrier-exciton and carrier-phonon interactions. The results indicate that static and transient THS are not only promising techniques for the characterization of monolayer semiconductors and their heterostructures, but also a potential platform for disruptive photonic and optoelectronic applications, including all-optical modulation and imaging.
Description
| openaire: EC/H2020/820423/EU//S2QUIP | openaire: EC/H2020/834742/EU//ATOP | openaire: EC/H2020/965124/EU//FEMTOCHIP
Keywords
electronic states, monolayer transition metal dichalcogenides, static third-harmonic spectroscopy, third-harmonic generation, transient third-harmonic spectroscopy
Other note
Citation
Wang, Y, Iyikanat, F, Rostami, H, Bai, X, Hu, X, Das, S, Dai, Y, Du, L, Zhang, Y, Li, S, Lipsanen, H, García de Abajo, F J & Sun, Z 2022, ' Probing Electronic States in Monolayer Semiconductors through Static and Transient Third-Harmonic Spectroscopies ', Advanced Materials, vol. 34, no. 3, 2107104 . https://doi.org/10.1002/adma.202107104