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

Jan Heye Buss, He Wang, Yiming Xu, Julian Maklar, Frederic Joucken, Lingkun Zeng, Sebastian Stoll, Chris Jozwiak, John Pepper, Yi De Chuang, Jonathan D. Denlinger, Zahid Hussain, Alessandra Lanzara, Robert A. Kaindl

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

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 ultra-high vacuum 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 1-2 × 10 10 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.

Original languageEnglish (US)
Article number023105
JournalReview of Scientific Instruments
Volume90
Issue number2
DOIs
StatePublished - Feb 1 2019

ASJC Scopus subject areas

  • Instrumentation

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