Journal Article

PUBDB-2021-02576

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Experimental evidence for a metastable state in FeTe$_{1−x}Se_{x}$ following coherent-phonon excitation

Yang, L. X. ; Rohde, G. ; Chen, Y. J. ; Shi, W. J. ; Liu, Z. K. ; Chen, F. ; Chen, Y. L. ; Rossnagel, K.DESY* ; Bauer, M. (Corresponding author)Extern*

2021
Elsevier New York, NY [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.elspec.2021.147085  doi:10.3204/PUBDB-2021-02576

Abstract: Changes of the electronic structure of FeTe$_{1−x}Se_{x}$ (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 A$_{1g}$(Te) phonon mode inFeTe$_{1−x}Se_{x}$. 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.

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Contributing Institute(s):

1. FS-SXQM (FS-SXQM)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2021

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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