Universität zu Köln

Peli, Simone, Puntel, Denny, Kopic, Damir, Sockol, Benjamin, Parmigiani, Fulvio and Cilento, Federico (2020). Time-resolved VUV ARPES at 10.8 eV photon energy and MHz repetition rate. J. Electron Spectrosc. Relat. Phenom., 243. AMSTERDAM: ELSEVIER. ISSN 1873-2526

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Abstract

The quest for mapping the femtosecond dynamics of the electronic band structure of complex materials over their full first Brillouin zone is pushing the development of schemes to efficiently generate ultrashort photon pulses in the VUV energy range. M present, the critical aspect in time- and angle-resolved photoelectron spectroscopy (TR-ARPES) is to combine a high photon energy with high photoemission count rates and a narrow pulse-bandwidth, necessary to achieve high energy resolution, while preserving a good time resolution and mitigating space-charge effects. Here we describe a novel approach to produce light pulses at 10.8 eV, combining high repetition rate operation (1-4 MHz), high energy resolution (similar to 26 meV) and space-charge free operation, with a time-resolution of similar to 700 fs. These results have been achieved by generating the ninth harmonic of a Yb fiber laser, through a phase-matched process of third harmonic generation in Xenon of the laser third harmonic. The full up-conversion process is driven by a seed pulse energy as low as 10 mu J, hence is easily scalable to multiMHz operation. This source opens the way to TR-ARPES experiments for the investigation of the electron dynamics over the full first Brillouin zone of most complex materials, with unprecedented energy and momentum resolutions and high count rates. The performances of the setup are tested by TR-ARPES on the topological insulator Bi2Se3.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Peli, Simone UNSPECIFIED UNSPECIFIED UNSPECIFIED Puntel, Denny UNSPECIFIED UNSPECIFIED UNSPECIFIED Kopic, Damir UNSPECIFIED UNSPECIFIED UNSPECIFIED Sockol, Benjamin UNSPECIFIED UNSPECIFIED UNSPECIFIED Parmigiani, Fulvio UNSPECIFIED UNSPECIFIED UNSPECIFIED Cilento, Federico UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-324788
DOI:	10.1016/j.elspec.2020.146978
Journal or Publication Title:	J. Electron Spectrosc. Relat. Phenom.
Volume:	243
Date:	2020
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1873-2526
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TOPOLOGICAL INSULATORS; HARMONIC-GENERATION; PHOTOEMISSION; RADIATION; LASER; NM Multiple languages Spectroscopy Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/32478