Antiphase Fermi-surface modulations accompanying displacement excitation in a parent compound of iron-based superconductors

Abstract

We investigate the transient electronic structure of BaFe2As2, a parent compound of iron-based superconductors, by time- and angle-resolved photoemission spectroscopy. In order to probe the entire Brillouin zone, we utilize extreme ultraviolet photons and observe photoemission intensity oscillation with the frequency of the A1g phonon which is antiphase between the zone-centered hole Fermi surfaces (FSs) and zone-cornered electron FSs. We attribute the antiphase behavior to the warping in one of the zone-centered hole FSs accompanying the displacement of the pnictogen height, and find that this displacement is the same direction as that induced by substitution of P for As, where superconductivity is induced by a structural modification without carrier doping in this system.

arXiv commentaccepted for publication as a Rapid Commun. in PRB

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Cited by in corpus (12)

• Time- and Angle-Resolved Photoemission Studies of Quantum Materials
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• HHG-laser-based time- and angle-resolved photoemission spectroscopy of quantum materials
• Photo-excitation band-structure engineering of 2H-NbSe${}_2$ probed by time- and angle-resolved photoemission spectroscopy
• Nematic response revealed by coherent phonon oscillations in BaFe${}_2$As${}_2$
• Time- and angle-resolved photoemission spectroscopy with wavelength-tunable pump and extreme ultraviolet probe enabled by twin synchronized amplifiers
• Suppression of atomic displacive excitation in photo-induced A${}_{1g}$ phonon mode of bismuth unveiled by low-temperature time-resolved x-ray diffraction
• Transient gap generation in BaFe${}_2$As${}_2$ driven by coherent lattice vibrations
• Photo-induced nonlinear band shift and valence transition in SmS
• Time-Resolved Photoemission Spectroscopy of Quantum Materials Using High Harmonic Generation: Probing Electron-Phonon Interactions and Non-Equilibrium Dynamics