A setup for extreme-ultraviolet ultrafast angle-resolved photoelectron spectroscopy at 50-kHz repetition rate

Abstract

Time- and angle-resolved photoelectron spectroscopy (trARPES) is a powerful method to track the ultrafast dynamics of quasiparticles and electronic bands in energy and momentum space. We present a setup for trARPES with 22.3 eV extreme-ultraviolet (XUV) femtosecond pulses at 50-kHz repetition rate, which enables fast data acquisition and access to dynamics across momentum space with high sensitivity. The design and operation of the XUV beamline, pump-probe setup, and UHV endstation are described in detail. By characterizing the effect of space-charge broadening, we determine an ultimate source-limited energy resolution of 60 meV, with typically 80-100 meV obtained at 1-2e10 photons/s probe flux on the sample. The instrument capabilities are demonstrated via both equilibrium and time-resolved ARPES studies of transition-metal dichalcogenides. The 50-kHz repetition rate enables sensitive measurements of quasiparticles at low excitation fluences in semiconducting MoSe${}_2$, with an instrumental time resolution of 65 fs. Moreover, photo-induced phase transitions can be driven with the available pump fluence, as shown by charge density wave melting in 1T-TiSe${}_2$. The high repetition-rate setup thus provides a versatile platform for sensitive XUV trARPES, from quenching of electronic phases down to the perturbative limit.

11 pages, 9 figures, updated accepted version with journal ref

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• Angle-resolved photoemission spectroscopy of the cuprate superconductors
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• Direct Optical Coupling to an Unoccupied Dirac Surface State in the Topological Insulator Bi${}_2$Se${}_3$
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• Bright high-repetition-rate source of narrowband extreme-ultraviolet harmonics beyond 22 eV
• Ultrafast extreme ultraviolet photoemission without space charge
• Abrupt transition in quasiparticle dynamics at optimal doping in a cuprate superconductor system
• Ultrafast Angle-Resolved Photoemission Spectroscopy of Quantum Materials
• Energy dissipation in the time domain governed by bosons in a correlated material
• Intervalley scattering in MoS${}_2$ imaged by two-photon photoemission with a high-harmonic probe
• Revealing the role of electrons and phonons in the ultrafast recovery of charge density wave correlations in 1$T$-TiSe${}_2$
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Cited by in corpus (22)

• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• Directly visualizing the momentum forbidden dark excitons and their dynamics in atomically thin semiconductors
• Time- and Angle-Resolved Photoemission Studies of Quantum Materials
• Cavity-enhanced high harmonic generation for XUV time-resolved ARPES
• Time- and momentum-resolved photoemission studies using time-of-flight momentum microscopy at a free-electron laser
• Excitonic and lattice contributions to the charge density wave in 1T-TiSe${}_2$ revealed by a phonon bottleneck
• A quantitative comparison of time-of-flight momentum microscopes and hemispherical analyzers for time- and angle-resolved photoemission spectroscopy experiments
• High resolution time- and angle-resolved photoemission spectroscopy with 11 eV laser pulses
• Tuning time and energy resolution in time-resolved photoemission spectroscopy with nonlinear crystals
• Exciton-Driven Renormalization of Quasiparticle Band Structure in Monolayer MoS2
• Extreme Ultraviolet Time- and Angle-Resolved Photoemission Spectroscopy with 21.5 meV Resolution using High-Order Harmonic Generation from a Turn-Key Yb:KGW Amplifier
• Advancing time- and angle-resolved photoemission spectroscopy: The role of ultrafast laser development
• A narrow bandwidth extreme ultra-violet light source for time- and angle-resolved photoemission spectroscopy
• An open-source, end-to-end workflow for multidimensional photoemission spectroscopy
• HHG-laser-based time- and angle-resolved photoemission spectroscopy of quantum materials
• Ultrafast creation of a light induced semimetallic state in strongly excited 1T-TiSe${}_2$
• Ultrafast Polarization-Tunable Monochromatic Extreme Ultraviolet Source at High-Repetition-Rate
• Multispectral time-resolved energy-momentum microscopy using high-harmonic extreme ultraviolet radiation
• A newly-designed femtosecond KBe${}_2$BO${}_3$F${}_2$ device with pulse duration down to 55 fs for time- and angle-resolved photoemission spectroscopy
• Time- and angle-resolved photoemission spectroscopy with wavelength-tunable pump and extreme ultraviolet probe enabled by twin synchronized amplifiers
• Generation of extreme ultraviolet laser by single-photon process
• Excited-state band structure mapping