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arXiv · 1907.10497

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

Yangyang Liu·John E. Beetar·Md Mofazzel Hosen·Gyanendra Dhakal·Christopher Sims·Firoza Kabir·Marc B. Etienne·Klauss Dimitri·Sabin Regmi·Yong Liu·Arjun K. Pathak·Dariusz Kaczorowski·Madhab Neupane·Michael Chini
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Abstract

Characterizing and controlling electronic properties of quantum materials require direct measurements of non-equilibrium electronic band structures over large regions of momentum space. Here, we demonstrate an experimental apparatus for time- and angle-resolved photoemission spectroscopy using high-order harmonic probe pulses generated by a robust, moderately high power (20 W) Yb:KGW amplifier with tunable repetition rate between 50 and 150 kHz. By driving high-order harmonic generation (HHG) with the second harmonic of the fundamental 1025 nm laser pulses, we show that single-harmonic probe pulses at 21.8 eV photon energy can be effectively isolated without the use of a monochromator. The on-target photon flux can reach 5 x 10^10 photons/second at 50 kHz, and the time resolution is measured to be 320 fs. The relatively long pulse duration of the Yb-driven HHG source allows us to reach an excellent energy resolution of 21.5 meV, which is achieved by suppressing the space-charge broadening using a low photon flux of 1.5 x 10^8 photons/second at a higher repetition rate of 150 kHz. The capabilities of the setup are demonstrated through measurements in the topological semimetal ZrSiS and the topological insulator Sb2-xGdxTe3.

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Yangyang Liu, John E. Beetar, Md Mofazzel Hosen, Gyanendra Dhakal, Christopher Sims, Firoza Kabir, Marc B. Etienne, Klauss Dimitri, Sabin Regmi, Yong Liu, Arjun K. Pathak, Dariusz Kaczorowski, Madhab Neupane, Michael Chini. 2019-12-10. 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. https://doi.org/10.1063/1.5121425

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