Ultrafast photocurrents in MoSe2 probed by terahertz spectroscopy
Open accessAbstract
We use the terahertz (THz) emission spectroscopy to study femtosecond photocurrent dynamics in the prototypical 2D semiconductor, transition metal dichalcogenide MoSe 2. We identify several distinct mechanisms producing THz radiation in response to an ultrashort (30 fs) optical excitation in a bilayer (BL) and a multilayer (ML) sample. In the ML, the THz radiation is generated at a picosecond timescale by out-of-plane currents due to the drift of photoexcited charge carriers in the surface electric field. The BL emission is generated by an in-plane shift current. Finally, we observe oscillations at about 23 THz in the emission from the BL sample. We attribute the oscillations to quantum beats between two excitonic states with energetic separation of ∼100 meV.
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For above-bandgap excitation of MoSe2, suppression of out-of-plane currents in the few-layer limit was demonstrated, with a dominant shift current contribution for bilayer samples but a dominant surface depletion drift current in thicker samples.
“For above-bandgap excitation of MoSe2, by contrast, the suppression of out-of-plane currents in the few-layer limit was demonstrated with a dominant shift current contribution for bilayer samples but a dominant surface depletion drift current in thicker samples260.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [260]
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References 66 · Cited by 27
- Authors
- Yagodkin, D., Nádvorník, L., Gueckstock, O., Gahl, C., Kampfrath, T., & Bolotin, K. I.
- Affiliations
- Freie Universität Berlin (DE)
- Fritz Haber Institute of the Max Planck Society (DE)
- Corresponding author
- Bolotin, Kirill I
- ORCID
- Venue
- 2D Materials
- Publisher
- IOP Publishing
- Published
- 2021-01-15
- Volume
- 8
- Issue
- 2
- Pages
- 025012
- ISSN
- 2053-1583 (ISSN-L)
- OpenAlex
- W3080244556
- Cited by
- 27
- References
- 66
- Citations by year
- 2026: 7 · 2025: 2 · 2024: 3 · 2023: 7 · 2022: 5 · 2021: 3
- FWCI
- 1.29
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- 2D Materials (publishedVersion, cc-by)
- arXiv (Cornell University) (acceptedVersion)
- Refubium (Universitätsbibliothek der Freien Universität Berlin) (submittedVersion, cc-by)
- Figshare (submittedVersion, cc-by)
- MPG.PuRe (Max Planck Society) (submittedVersion, other-oa)
- arXiv (Cornell University)
- Universitätsbibliothek der FU Berlin Hochschulschriftenstelle u. Dokumentenserver (cc-by)
- Funders
- H2020 European Research Council (TERAMAG/681917)
- Deutsche Forschungsgemeinschaft (TRR227 A05)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
- Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
- Keywords
- MoSe2, transition metal dichalcogenides, terahertz emission, shift current, carrier drift, surface electric field, two-dimensional semiconductors
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