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 language | English |
---|---|
Article number | 165421 |
Journal | Physical Review B |
Volume | 99 |
Issue number | 16 |
DOIs | |
Publication status | Published - 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.
Funders | Funder number |
---|---|
Centre of Excellence for Dirac Materials | 11744 |
Research Centre for Natural Sciences | DFF-4090-00125, DFF-4002-00029, DFF-6108-00409 |
Rutherford Appleton Laboratory | |
Natur og Univers, Det Frie Forskningsråd | |
Villum Fonden | 15375 |
Leverhulme Trust | |
Royal Historical Society | |
Aarhus Universitets Forskningsfond |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics