High resolution time- and angle-resolved photoemission spectroscopy with 11 eV laser pulses
Author(s)Lee, Changmin; Rohwer, Timm; Sie, Edbert Jarvis; Zhong, Alfred; Baldini, Edoardo; Gardner, Dillion R.; Lee, Young S; Gedik, Nuh; ... Show more Show less
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Performing time- and angle-resolved photoemission (tr-ARPES) spectroscopy at high momenta necessitates extreme ultraviolet laser pulses, which are typically produced via high harmonic generation (HHG). Despite recent advances, HHG-based setups still require large pulse energies (from hundreds of μJ to mJ) and their energy resolution is limited to tens of meV. Here, we present a novel 11 eV tr-ARPES setup that generates a flux of 5 × 1010 photons/s and achieves an unprecedented energy resolution of 16 meV. It can be operated at high repetition rates (up to 250 kHz) while using input pulse energies down to 3 μJ. We demonstrate these unique capabilities by simultaneously capturing the energy and momentum resolved dynamics in two well-separated momentum space regions of a charge density wave material ErTe3. This novel setup offers the opportunity to study the non-equilibrium band structure of solids with exceptional energy and time resolutions at high repetition rates.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Materials Research Laboratory
Review of Scientific Instruments
Lee, Changmin et al. “High resolution time- and angle-resolved photoemission spectroscopy with 11 eV laser pulses.” Review of Scientific Instruments, 91, 4 (April 2020): 043102 © 2020 The Author(s)