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

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Shi,  W. J.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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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.


Cite as: http://hdl.handle.net/21.11116/0000-0008-ACB5-A
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.