Detecting electron-phonon couplings during photo-induced phase transition

Abstract

Photo-induced phase transitions have been intensively studied owing to the ability to control a material of interest in the ultrafast manner, which can induce exotic phases unable to be attained at equilibrium. However, the key mechanisms are still under debate, and it has currently been a central issue how the couplings between the electron, lattice, and spin degrees of freedom are evolving during photo-induced phase transitions. Here, we develop a new analysis method, frequency-domain angle-resolved photoemission spectroscopy, to gain precise insight into electron-phonon couplings during photo-induced insulator-to-metal transitions for Ta${}_2$NiSe${}_5$. We demonstrate that multiple coherent phonons generated by displacive excitations show band-selective coupling to the electrons. Furthermore, we find that the lattice modulation corresponding to the 2 THz phonon mode, where Ta lattice is sheared along the a-axis, is the most relevant for the photo-induced semimetallic state.

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Cited by in corpus (25)

• Time- and Angle-Resolved Photoemission Studies of Quantum Materials
• Ultrafast dynamics of electrons and phonons: from the two-temperature model to the time-dependent Boltzmann equation
• Imaging the coherent propagation of collective modes in the excitonic insulator candidate Ta${}_2$NiSe${}_5$ at room temperature
• Photoinduced multistage phase transitions in Ta2NiSe5
• Ultrafast melting and recovery of collective order in the excitonic insulator Ta${}_2$NiSe${}_5$
• Photo-induced phase transition and associated time scales in the excitonic insulator Ta${}_2$NiSe${}_5$
• A New Era of Excitonic Insulators
• Unveiling the underlying interactions in Ta2NiSe5 from photo-induced lifetime change
• Disentangling lattice and electronic instabilities in the excitonic insulator candidate Ta${}_2$NiSe${}_5$ by nonequilibrium spectroscopy
• Advancing time- and angle-resolved photoemission spectroscopy: The role of ultrafast laser development
• HHG-laser-based time- and angle-resolved photoemission spectroscopy of quantum materials
• Layer-by-layer disentanglement of Bloch states via frequency-domain photoemission
• First-principles modelling for time-resolved ARPES under different pump-probe conditions
• Pressure suppression of the excitonic insulator state in Ta2NiSe5 observed by optical conductivity
• Theory of time-crystalline behaviour mediated by phonon squeezing in Ta2NiSe5
• Phase-resolved frequency-domain analysis of the photoemission spectra for photoexcited 1T-TaS2 in the Mott insulating charge density wave state
• Third-harmonic generation in excitonic insulators
• Coherent Phonons, Localization and Slow Polaron Formation in Lead-free Gold Perovskite
• Exact solution of two simple non-equilibrium electron-phonon and electron-electron coupled systems: the atomic limit of the Holstein-Hubbard model and the generalized Hatsugai-Komoto model
• Unveiling van Hove singularity modulation and fluctuated charge order in kagome superconductor $\mathrm{Cs}{\mathrm{V}}_3\mathrm{S}{\mathrm{b}}_5$ via time-resolved ARPES
• Time- and angle-resolved photoemission spectroscopy with wavelength-tunable pump and extreme ultraviolet probe enabled by twin synchronized amplifiers
• Analysis methodology of coherent oscillations in time- and angle-resolved photoemission spectroscopy
• Time-Resolved Photoemission Spectroscopy of Quantum Materials Using High Harmonic Generation: Probing Electron-Phonon Interactions and Non-Equilibrium Dynamics
• Time- and angle-resolved photoelectron spectroscopy of strong-field light-dressed solids: prevalence of the adiabatic band picture
• Coherent Phonon-Driven Band Renormalizations in 1T${}^{\prime }$-MoTe${}_2$