Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 37: Poster: Electronic Structure of Surfaces and Spectroscopy of Surface States
O 37.5: Poster
Tuesday, March 19, 2024, 18:00–20:00, Poster D
Soft X-ray momentum-resolved photoelectron spectroscopy with a momentum microscope at Diamond Light Source — •Deepnarayan Biswas1, Matthias Schmitt1,2, Jieyi Liu1, Olena Tkach3, Ralph Claessen2, Gerd Schönhense3, and Tien-Lin Lee1 — 1Diamond Light Source Ltd., UK — 2University of Würzburg, Germany — 3University of Mainz, Germany
Angle-resolved photoelectron spectroscopy (ARPES) experiments are usually performed with excitation energies below ~100 eV to harness the higher photoionisation cross-sections and better energy and (in-plane) momentum resolutions. However, the very short electron mean free paths at low energies severely limit the bulk sensitivity. It is therefore desirable to extend ARPES to the soft x-ray (SX) range, which opens up the opportunity for probing unconventional electronic structures at buried interfaces, studying 3D electronic systems etc.
We are currently commissioning a SX-ARPES end-station at Beamline I09 at DLS, equipped with a state-of-the-art momentum microscope (MM). MMs preserve the momentum view and resolution irrespective of the excitation energy, which is advantageous to ARPES performed at high energies. In addition, MMs enable selective studies of micron/sub-micron-sized sample areas using field apertures. Our MM is uniquely designed to use a single hemispherical analyser followed by a time-of-flight section fitted with a fast delay-line detector as a combined energy filter, resulting in highly efficient data collection. In this poster, we will present current progress and the potential applications of this new facility to quantum materials research.
Keywords: Soft X-ray ARPES; Momentum microscope; Synchrotron