High-harmonic generation from artificially stacked 2D crystals
Abstract: We report a coherent layer-by-layer build-up of high-order harmonic generation (HHG) in artificially stacked transition metal dichalcogenides (TMDC) crystals in their various stacking configurations. In the experiments, millimeter-sized single crystalline monolayers are synthesized using the gold foil-exfoliation method, followed by artificially stacking on a transparent substrate. High-order harmonics up to the 19th order are generated by the interaction with a mid-infrared (MIR) driving laser. We find that the generation is sensitive to both the number of layers and their relative orientation. For AAAA stacking configuration, both odd- and even-orders exhibit a quadratic increase in intensity as a function of the number of layers, which is a signature of constructive interference of high-harmonic emission from successive layers. Particularly, we observe some deviations from this scaling at photon energies above the bandgap, which is explained by self-absorption effects. For AB and ABAB stacking, even-order harmonics remain below the detection level, consistent with the presence of inversion symmetry. Our study confirms our capability of producing nonperturbative high-order harmonics from stacked layered materials subjected to intense MIR fields without damaging samples. Our results have implications for optimizing solid-state HHG sources at the nanoscale and developing high-harmonics as an ultrafast probe of artificially stacked layered materials. Because the HHG process is a strong-field driven process, it has the potential to probe high-momentum and energy states in the bandstructure combined with atomic-scale sensitivity in real space, making it an attractive probe of novel material structures such as the Moiré pattern.
- Standort
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Deutsche Nationalbibliothek Frankfurt am Main
- Umfang
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Online-Ressource
- Sprache
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Englisch
- Erschienen in
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High-harmonic generation from artificially stacked 2D crystals ; volume:12 ; number:2 ; year:2023 ; pages:255-261 ; extent:7
Nanophotonics ; 12, Heft 2 (2023), 255-261 (gesamt 7)
- Urheber
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Heide, Christian
Kobayashi, Yuki
Johnson, Amalya C.
Heinz, Tony F.
Reis, David A.
Liu, Fang
Ghimire, Shambhu
- DOI
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10.1515/nanoph-2022-0595
- URN
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urn:nbn:de:101:1-2023020113295355692793
- Rechteinformation
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Letzte Aktualisierung
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15.08.2025, 07:29 MESZ
Datenpartner
Deutsche Nationalbibliothek. Bei Fragen zum Objekt wenden Sie sich bitte an den Datenpartner.
Beteiligte
- Heide, Christian
- Kobayashi, Yuki
- Johnson, Amalya C.
- Heinz, Tony F.
- Reis, David A.
- Liu, Fang
- Ghimire, Shambhu
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