"High resolution angle resolved photoemission with tabletop 11 eV laser"

Yu He: Inna M. Vishik, Ming Yi, Shuolong Yang, Zhongkai Liu, James J. Lee, Sudi Chen, Slavko N. Rebec, Dominik Leuenberger, Alfred Zong, C. Michael Jefferson, Robert G. Moore, Patrick S. Kirchmann, Andrew J. Merriam, and Zhi-Xun Shen; Review of Scientific Instruments, 01/24/16.

Additional Authors: Inna M. Vishik, Ming Yi, Shuolong Yang, Zhongkai Liu, James J. Lee, Sudi Chen, Slavko N. Rebec, Dominik Leuenberger, Alfred Zong, C. Michael Jefferson, Robert G. Moore, Patrick S. Kirchmann, Andrew J. Merriam, and Zhi-Xun Shen

Abstract:

We developed a table-top vacuum ultraviolet (VUV) laser with 113.778 nm wavelength (10.897 eV) and demonstrated its viability as a photon source for high resolution angle-resolved photoemissionspectroscopy (ARPES). This sub-nanosecond pulsed VUV laser operates at a repetition rate of 10 MHz, provides a flux of 2 × 1012 photons/s, and enables photoemission with energy and momentum resolutions better than 2 meV and 0.012 Å−1, respectively. Space-charge induced energy shifts and spectral broadenings can be reduced below 2 meV. The setup reaches electron momenta up to 1.2 Å−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.