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Ultrafast dynamics ...
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Richter, SteffenLinköpings universitet,Halvledarmaterial,Tekniska fakulteten,ELI Beamlines Fyzikalni Ustav AV CR, Czech Republic; Univ Leipzig, Germany
(författare)
Ultrafast dynamics of hot charge carriers in an oxide semiconductor probed by femtosecond spectroscopic ellipsometry
- Artikel/kapitelEngelska2020
Förlag, utgivningsår, omfång ...
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2020-08-25
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IOP PUBLISHING LTD,2020
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electronicrdacarrier
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LIBRIS-ID:oai:DiVA.org:liu-170005
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https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170005URI
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https://doi.org/10.1088/1367-2630/aba7f3DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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Funding Agencies|Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)German Research Foundation (DFG) [SFB 762, 31047526, FOR 1616 (SCHM2710/2)]; project Advanced research using high intensity laser produced photons and particles (ADONIS) from the European Regional Development Fund [CZ.02.1.01/0.0/0.0/16_019/0000789]; National Program of Sustainability II project ELI Beamlines - International Center of Excellence (ELISus) [LQ1606]; project Structural dynamics of biomolecular systems (ELIBIO), from the European Regional Development Fund [CZ.02.1.01/0.0/0.0/15_003/0000447]; Ministry of Education, Youth and Sports as part of targeted support from the National Programme of Sustainbility II; Chalmers Area of Advanced Materials Science; National Science FoundationNational Science Foundation (NSF) [DMR-1555153, CBET-1437230, OCI-0725070, ACI-1238993, DMR-1505172]; state of Illinois
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Many linked processes occur concurrently in strongly excited semiconductors, such as interband and intraband absorption, scattering of electrons and holes by the heated lattice, Pauli blocking, bandgap renormalization and the formation of Mahan excitons. In this work, we disentangle their dynamics and contributions to the optical response of a ZnO thin film. Using broadband pump-probe ellipsometry, we can directly and unambiguously obtain the real and imaginary part of the transient dielectric function which we compare with first-principles simulations. We find interband and excitonic absorption partially blocked and screened by the photo-excited electron occupation of the conduction band and hole occupation of the valence band (absorption bleaching). Exciton absorption turns spectrally narrower upon pumping and sustains the Mott transition, indicating Mahan excitons. Simultaneously, intra-valence-band transitions occur at sub-picosecond time scales after holes scatter to the edge of the Brillouin zone. Our results pave new ways for the understanding of non-equilibrium charge-carrier dynamics in materials by reliably distinguishing between changes in absorption coefficient and refractive index, thereby separating competing processes. This information will help to overcome the limitations of materials for high-power optical devices that owe their properties from dynamics in the ultrafast regime.
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Herrfurth, OliverUniv Leipzig, Germany
(författare)
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Espinoza, ShirlyELI Beamlines Fyzikalni Ustav AV CR, Czech Republic
(författare)
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Rebarz, MateuszELI Beamlines Fyzikalni Ustav AV CR, Czech Republic
(författare)
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Kloz, MiroslavELI Beamlines Fyzikalni Ustav AV CR, Czech Republic
(författare)
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Leveillee, Joshua A.Univ Illinois, IL 61801 USA
(författare)
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Schleife, AndreUniv Illinois, IL 61801 USA
(författare)
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Zollner, StefanNew Mexico State Univ, NM 88003 USA; Fyzikalni Ustav AV CR, Czech Republic
(författare)
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Grundmann, MariusUniv Leipzig, Germany
(författare)
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Andreasson, JakobELI Beamlines Fyzikalni Ustav AV CR, Czech Republic
(författare)
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Schmidt-Grund, RuedigerUniv Leipzig, Germany; Tech Univ Ilmenau, Germany
(författare)
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Linköpings universitetHalvledarmaterial
(creator_code:org_t)
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Ingår i:New Journal of Physics: IOP PUBLISHING LTD22:81367-2630
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Richter, Steffen
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Herrfurth, Olive ...
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Espinoza, Shirly
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Rebarz, Mateusz
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Kloz, Miroslav
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Leveillee, Joshu ...
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visa fler...
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Schleife, Andre
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Zollner, Stefan
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Grundmann, Mariu ...
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Andreasson, Jako ...
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Schmidt-Grund, R ...
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