Time-, spin-, and angle-resolved photoemission spectroscopy with a 1-MHz 10.7-eV pulse laser

Author:

Kawaguchi Kaishu1ORCID,Kuroda Kenta123ORCID,Zhao Z.4ORCID,Tani S.1ORCID,Harasawa A.1ORCID,Fukushima Y.1ORCID,Tanaka H.1ORCID,Noguchi R.1ORCID,Iimori T.1,Yaji K.5ORCID,Fujisawa M.1,Shin S.6,Komori F.1ORCID,Kobayashi Y.1ORCID,Kondo Takeshi17ORCID

Affiliation:

1. Institute for Solid State Physics (ISSP), The University of Tokyo 1 , Kashiwa, Chiba 277-8581, Japan

2. Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 2 , Hiroshima 739-8526, Japan

3. International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, Higashi-Hiroshima 3 , Hiroshima 739-8526, Japan

4. School of Information Science and Engineering, Shandong University 4 , Qingdao 266237, China

5. Center for Basic Research on Materials, National Institute for Materials Science (NIMS) 5 , Tsukuba, Ibaraki 305-0003, Japan

6. Office of University Professor, The University of Tokyo 6 , Chiba 277-8581, Japan

7. Trans-Scale Quantum Science Institute, The University of Tokyo 7 , Bunkyo-ku, Tokyo 113-0033, Japan

Abstract

We describe a setup of time-, spin-, and angle-resolved photoemission spectroscopy (tr-SARPES) employing a 10.7 eV (λ = 115.6 nm) pulse laser at a 1 MHz repetition rate as a probe photon source. This equipment effectively combines the technologies of a high-power Yb:fiber laser, ultraviolet-driven harmonic generation in Xe gas, and a SARPES apparatus equipped with very-low-energy-electron-diffraction spin detectors. A high repetition rate (1 MHz) of the probe laser allows experiments with the photoemission space-charge effects significantly reduced, despite a high flux of 1013 photons/s on the sample. The relatively high photon energy (10.7 eV) also brings the capability of observing a wide momentum range that covers the entire Brillouin zone of many materials while ensuring high momentum resolution. The experimental setup overcomes the low efficiency of spin-resolved measurements, which gets even more severe for the pump-probed unoccupied states, and affords the opportunity to investigate ultrafast electron and spin dynamics of modern quantum materials with energy and time resolutions of 25 meV and 360 fs, respectively.

Funder

Japan Society for the Promotion of Science

Kao Foundation for Arts and Sciences

Murata Science Foundation

Asahi Glass Foundation

Japan Science Society

Publisher

AIP Publishing

Subject

Instrumentation

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