High Resolution Angle Resolved Photoemission with Tabletop 11eV Laser

Abstract

We developed a table-top vacuum ultraviolet (VUV) laser with $113.778$nm wavelength (10.897eV) and demonstrated its viability as a photon source for high resolution angle-resolved photoemission spectroscopy (ARPES). This sub-nanosecond pulsed VUV laser operates at a repetition rate of 10MHz, provides a flux of 2$\times$10${}^{12}$ photons/second, and enables photoemission with energy and momentum resolutions better than 2meV and 0.012Å${}^{-1}$, respectively. Space-charge induced energy shifts and spectral broadenings can be reduced below 2meV. The setup reaches electron momenta up to 1.2Å${}^{-1}$, granting full access to the first Brillouin zone of most materials. Control over the linear polarization, repetition rate, and photon flux of the VUV source facilitates ARPES investigations of a broad range of quantum materials, bridging the application gap between contemporary low energy laser-based ARPES and synchrotron-based ARPES. We describe the principles and operational characteristics of this source, and showcase its performance for rare earth metal tritellurides, high temperature cuprate superconductors and iron-based superconductors.

12 pages, 10 figures

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• New Developments in Laser-Based Photoemission Spectroscopy and its Scientific Applications: a Key Issues Review
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• Spectroscopic data de-noising via training-set-free deep learning method
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• Second derivative analysis and alternative data filters for multi-dimensional spectroscopies: a Fourier-space perspective
• Re-Symmetrizing the Broken Symmetry with Isotropic Hydrostatic Pressure
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• Generation of extreme ultraviolet laser by single-photon process
• Development of a 10.8-eV Tabletop Femtosecond Laser with Tunable Polarization for High-Resolution Angle-Resolved Photoemission Spectroscopy
• Electronic and topological properties of the van der Waals layered superconductor PtTe
• High repetition rate Time-Resolved VUV ARPES at 10.8 eV photon energy