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  Experimental evidence for a metastable state in FeTe1−xSex following coherent-phonon excitation

Yang, L. X., Rohde, G., Chen, Y. J., Shi, W. J., Liu, Z. K., Chen, F., et al. (2021). Experimental evidence for a metastable state in FeTe1−xSex following coherent-phonon excitation. Journal of Electron Spectroscopy and Related Phenomena, 250: 147085, pp. 1-5. doi:10.1016/j.elspec.2021.147085.

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 Creators:
Yang, L. X.1, Author
Rohde, G.1, Author
Chen, Y. J.1, Author
Shi, W. J.2, Author              
Liu, Z. K.1, Author
Chen, F.1, Author
Chen, Y. L.1, Author
Rossnagel, K.1, Author
Bauer, M.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              

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Free keywords: Electronic structure, Infrared devices, Infrared lasers, Iron-based Superconductors, Laser excitation, Phonons, Photoelectron spectroscopy, Ultrafast lasers, Ultraviolet lasers, Coherent excitations, Equilibrium state, Experimental evidence, Extreme Ultraviolet, Meta-stable state, Near-infrared lasers, Photoexcited carriers, Ultrafast excitation, Excited states
 Abstract: Changes of the electronic structure of FeTe1−xSex (x = 0, 0.3) upon ultrafast excitation with near-infrared laser pulses are investigated using time- and angle-resolved extreme ultraviolet photoemission spectroscopy. At different temperatures and for different doping levels we observe a global oscillation of energy bands near the Fermi energy driven by the coherent excitation of the A1g(Te) phonon mode in FeTe1−xSex. Prominently, photo-induced band shifts and a spectral weight reduction persist for at least 300 ps, long after the decay of the photo-excited carriers and the damping of the coherent phonons. We argue that the system escapes from the original equilibrium state and is transiently trapped in a possibly metastable state envisioning a purely optical means of manipulating the electronic structure in an iron-based superconductor. © 2021 Elsevier B.V.

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Language(s): eng - English
 Dates: 2021-05-242021-05-24
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.elspec.2021.147085
 Degree: -

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Title: Journal of Electron Spectroscopy and Related Phenomena
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B.V.
Pages: - Volume / Issue: 250 Sequence Number: 147085 Start / End Page: 1 - 5 Identifier: ISSN: 0368-2048
CoNE: https://pure.mpg.de/cone/journals/resource/954925524767