Transient hot electron dynamics in single-layer TaS2

Federico Andreatta, Habib Rostami, Antonija Grubišić Čabo, Marco Bianchi, Charlotte E. Sanders, Deepnarayan Biswas, Cephise Cacho, Alfred J.H. Jones, Richard T. Chapman, Emma Springate, Phil D.C. King, Jill A. Miwa, Alexander Balatsky, Søren Ulstrup, Philip Hofmann

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14 Citations (SciVal)

Abstract

Using time- and angle-resolved photoemission spectroscopy, we study the response of metallic single-layer TaS2 in the 1H structural modification to the generation of excited carriers by a femtosecond laser pulse. A complex interplay of band structure modifications and electronic temperature increase is observed and analyzed by direct fits of model spectral functions to the two-dimensional (energy and k-dependent) photoemission data. Upon excitation, the partially occupied valence band is found to shift to higher binding energies by up to ≈100meV, accompanied by electronic temperatures exceeding 3000 K. These observations are explained by a combination of temperature-induced shifts of the chemical potential, as well as temperature-induced changes in static screening. Both contributions are evaluated in a semiempirical tight-binding model. The shift resulting from a change in the chemical potential is found to be dominant.

Original languageEnglish
Article number165421
JournalPhysical Review B
Volume99
Issue number16
DOIs
Publication statusPublished - 16 Apr 2019

Funding

We thank Phil Rice and Alistair Cox for technical support during the Artemis beamtime. We gratefully acknowledge funding from VILLUM FONDEN through the Young Investigator Program (Grant No. 15375) and the Centre of Excellence for Dirac Materials (Grant No. 11744), the Danish Council for Independent Research, Natural Sciences under the Sapere Aude program (Grants No. DFF-4002-00029, No. DFF-6108-00409, and No. DFF-4090-00125), the Aarhus University Research Foundation, The Leverhulme Trust and The Royal Society. Access to the Artemis Facility was funded by U.K. Research and Innovation Science and Technology Facilities Council.

FundersFunder number
Centre of Excellence for Dirac Materials11744
Research Centre for Natural SciencesDFF-4090-00125, DFF-4002-00029, DFF-6108-00409
Rutherford Appleton Laboratory
Natur og Univers, Det Frie Forskningsråd
Villum Fonden15375
Leverhulme Trust
Royal Historical Society
Aarhus Universitets Forskningsfond

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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