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  • Majchrzak, PaulinaAarhus Univ, Interdisciplinary Nanosci Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark. (author)

Spectroscopic view of ultrafast charge carrier dynamics in single- and bilayer transition metal dichalcogenide semiconductors

  • Article/chapterEnglish2021

Publisher, publication year, extent ...

  • Elsevier BV,2021
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-299462
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299462URI
  • https://doi.org/10.1016/j.elspec.2021.147093DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • QC 20210811
  • The quasiparticle spectra of atomically thin semiconducting transition metal dichalcogenides (TMDCs) and their response to an ultrafast optical excitation critically depend on interactions with the underlying substrate. Here, we present a comparative time- and angle-resolved photoemission spectroscopy (TR-ARPES) study of the transient electronic structure and ultrafast carrier dynamics in the single- and bilayer TMDCs MoS2 and WS2 on three different substrates: Au(111), Ag(111) and graphene/SiC. The photoexcited quasiparticle bandgaps are observed to vary over the range of 1.9-2.5 eV between our systems. The transient conduction band signals decay on a sub-50 fs timescale on the metals, signifying an efficient removal of photoinduced carriers into the bulk metallic states. On graphene, we instead observe a fast timescale on the order of 170 fs, followed by a slow dynamics for the conduction band decay in MoS2. These timescales are explained by Auger recombination involving MoS2 and in-gap defect states. In bilayer TMDCs on metals we observe a complex redistribution of excited holes along the valence band that is substantially affected by interactions with the continuum of bulk metallic states.

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  • Volckaert, KlaraAarhus Univ, Interdisciplinary Nanosci Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark. (author)
  • Grubisic-Cabo, AntonijaKTH,Tillämpad fysik(Swepub:kth)u1a8lj3o (author)
  • Biswas, DeepnarayanAarhus Univ, Interdisciplinary Nanosci Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark. (author)
  • Bianchi, MarcoAarhus Univ, Interdisciplinary Nanosci Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark. (author)
  • Mahatha, Sanjoy K.DESY, Ruprecht Haensel Lab, D-22607 Hamburg, Germany. (author)
  • Dendzik, MaciejKTH,Material- och nanofysik(Swepub:kth)u1dqoluh (author)
  • Andreatta, FedericoAarhus Univ, Interdisciplinary Nanosci Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark. (author)
  • Gronborg, Signe S.Aarhus Univ, Interdisciplinary Nanosci Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark. (author)
  • Markovic, IgorUniv St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland.;Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany. (author)
  • Riley, Jonathon M.Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland. (author)
  • Johannsen, Jens C.Ecole Polytech Fed Lausanne EPFL, Inst Condensed Matter Phys, Lausanne, Switzerland. (author)
  • Lizzit, DanielUniv Udine, DPIA, Via Sci 206, I-33100 Udine, Italy. (author)
  • Bignardi, LucaUniv Trieste, Dept Phys, Via Valerio 2, I-34127 Trieste, Italy. (author)
  • Lizzit, SilvanoElettra Sincrotrone Trieste SCpA, SS 14 Km 163-5, I-34149 Trieste, Italy. (author)
  • Cacho, CephiseDiamond Light Source, Didcot OX11 0DE, Oxon, England. (author)
  • Alexander, OliverSTFC Rutherford Appleton Lab, Cent Laser Facil, Harwell, Berks, England. (author)
  • Matselyukh, DanSTFC Rutherford Appleton Lab, Cent Laser Facil, Harwell, Berks, England. (author)
  • Wyatt, Adam S.STFC Rutherford Appleton Lab, Cent Laser Facil, Harwell, Berks, England. (author)
  • Chapman, Richard T.STFC Rutherford Appleton Lab, Cent Laser Facil, Harwell, Berks, England. (author)
  • Springate, EmmaSTFC Rutherford Appleton Lab, Cent Laser Facil, Harwell, Berks, England. (author)
  • Lauritsen, Jeppe, VAarhus Univ, Interdisciplinary Nanosci Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark. (author)
  • King, Phil D. C.Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland. (author)
  • Sanders, Charlotte E.Aarhus Univ, Interdisciplinary Nanosci Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark. (author)
  • Miwa, Jill A.Aarhus Univ, Interdisciplinary Nanosci Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark. (author)
  • Hofmann, PhilipAarhus Univ, Interdisciplinary Nanosci Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark. (author)
  • Ulstrup, SorenAarhus Univ, Interdisciplinary Nanosci Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark. (author)
  • Aarhus Univ, Interdisciplinary Nanosci Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark.Tillämpad fysik (creator_code:org_t)

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  • In:Journal of Electron Spectroscopy and Related Phenomena: Elsevier BV2500368-20481873-2526

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