A narrow bandwidth extreme ultra-violet light source for time- and angle-resolved photoemission spectroscopy

Guo, Qinda; Dendzik, Maciej; Čabo, Antonija Grubišić; Berntsen, Magnus H.; Liu, Cong; Chen, Wanyu; Matta, Bharti; Starke, Ulrich; Hessmo, Björn; Weissenrieder, Jonas; Tjernberg, Oscar

doi:10.1063/4.0000149

Cited by 17 publications

(6 citation statements)

References 57 publications

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“…The AFM data was analyzed using Gwyddion software package. [85] Angle-Resolved Photoemission Spectroscopy:: ARPES measurements were performed at the BALTAZAR laboratory (KTH Royal Institute of Technology in Stockholm, Sweden) [86] and at the SGM3 beamline of the synchrotron radiation facility ASTRID2 (Aarhus University, Denmark). [87] The measurements were performed at room temperature with base pressure better than 1 × 10 −10 mbar.…”

Section: Methodsmentioning

confidence: 99%

In Situ Exfoliation Method of Large‐Area 2D Materials

et al. 2023

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2D materials provide a rich platform to study novel physical phenomena arising from quantum confinement of charge carriers. Many of these phenomena are discovered by surface sensitive techniques, such as photoemission spectroscopy, that work in ultra-high vacuum (UHV). Success in experimental studies of 2D materials, however, inherently relies on producing adsorbate-free, large-area, high-quality samples. The method that yields 2D materials of highest quality is mechanical exfoliation from bulk-grown samples. However, as this technique is traditionally performed in a dedicated environment, the transfer of samples into vacuum requires surface cleaning that might diminish the quality of the samples. In this article, a simple method for in situ exfoliation directly in UHV is reported, which yields large-area, single-layered films. Multiple metallic and semiconducting transition metal dichalcogenides are exfoliated in situ onto Au, Ag, and Ge. The exfoliated flakes are found to be of sub-millimeter size with excellent crystallinity and purity, as supported by angle-resolved photoemission spectroscopy, atomic force microscopy, and low-energy electron diffraction. The approach is well-suited for air-sensitive 2D materials, enabling the study of a new suite of electronic properties. In addition, the exfoliation of surface alloys and the possibility of controlling the substrate-2D material twist angle is demonstrated.

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Section: Methodsmentioning

confidence: 99%

In Situ Exfoliation Method of Large‐Area 2D Materials

et al. 2023

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“…Using gratings or selectable multilayer bandpass mirrors and thin lm lters, recent TR-ARPES studies have achieved a high energy resolution down to 9 meV. 68,73 To ensure sufficient EUV output in TR-ARPES experiments, the visible or IR femtosecond pump lasers for high harmonic generation oen need to be at intense powers of 100 mJ to several mJ per pulse. This has been initially achieved with Ti:sapphire amplier systems with repetition frequencies of a few kHz.…”

Section: Development Of Light Sourcesmentioning

confidence: 99%

“…Recent development of HHG TR-ARPES setups has improved the repetition rates to hundreds of kHz and up to 88 MHz, using Yb ber laser or Ti:sapphire long cavity oscillators. 69,72,73,78 HHG efficiency from the low pulse energy at MHz repetition rate can be enhanced by optical cavities, obtaining both high EUV output uence and minimal space charge distortions in the TR-ARPES. 69,78 Recently, high-power ytterbium lasers and amplier systems with both high photon energy and high repetition rates have become commercially available.…”

Section: Development Of Light Sourcesmentioning

confidence: 99%

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Time- and angle-resolved photoemission spectroscopy (TR-ARPES) of TMDC monolayers and bilayers

Liu

2023

Chem. Sci.

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“…Ref. 137,138 , for example, show that the XUV spectrum depends sensitively on the HHG generation conditions. For these reasons, we vary the energy-resolution FWHM (∆ E ) and compare the resulting ReΣ and ImΣ in Fig.…”

Section: Algorithmmentioning

confidence: 99%

Far-from-Equilibrium Quasiparticle Dynamics in Graphene

Düvel¹

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Comprehending far-from-equilibrium many-body interactions is one of the major goals of current ultrafast condensed matter physics research. Here, a particularly interesting but barely understood situation occurs during a strong optical excitation, where the electron and phonon systems can be significantly perturbed and the quasiparticle distributions cannot be described with equilibrium functions. In this thesis, we use time-and angle-resolved photoelectron spectroscopy (trARPES) to study such far-from-equilibrium many-body interactions for the prototypical material graphene by evaluating the low-energy non-equilibrium quasiparticle self-energy at the femtosecond timescale. The low-energy quasiparticle response, however, is at first inaccessible due to resolution artifacts caused by the spectrally our broad XUV probe pulses, which are unavoidable due to the time-bandwidth-product. Therefore, we apply a Lucy-Richardson deconvolution algorithm (LRD) to the ARPES spectra. Furthermore, we introduce rigorous benchmarking of the LRD to assure physical-meaningful results. To deliver angle-resolved photoemission spectroscopy (ARPES) data in the necessary quality for this LRD approach, we built a trARPES setup with an extreme ultraviolet (XUV) probe source in this thesis. This XUV probe source can be switched between an energy-resolution optimized beamline and time-resolution optimized beamline. With this experiment, we find remarkable transient renormalizations of the quasiparticle self-energy caused by the photo-induced nonequilibrium conditions, which are in accordance with first-principles theoretical modeling.These observations can be understood by ultrafast scatterings between far-from-equilibrium electrons and strongly-coupled optical phonons, which signifies the crucial role of ultrafast non-equilibrium dynamics on many-body interactions. Our results advance the understanding of many-body physics in extreme conditions, which is important for any endeavor to optically manipulate or create emergent states of matter. iii Acknowledgements Hier würde ich gerne einigen Personen danken. Ich danke meiner ganzen Familie und allen Freunden für die Unterstützung während der Arbeit. Ich danke Prof. Dr. Stefan Mathias für die Ermöglichung und Betreuung bei dieser Arbeit. Ich danke Dr. Marcel Reutzel, Dr. Sabine Steil, Dr. Matthijs Jansen und Dr. Daniel Steil für die Unterstützung und Betreuung während der Arbeit. Ich danke meiner Prüfungskommission, Gutachtern und dem

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A narrow bandwidth extreme ultra-violet light source for time- and angle-resolved photoemission spectroscopy

Cited by 17 publications

References 57 publications

In Situ Exfoliation Method of Large‐Area 2D Materials

In Situ Exfoliation Method of Large‐Area 2D Materials

Time- and angle-resolved photoemission spectroscopy (TR-ARPES) of TMDC monolayers and bilayers

Far-from-Equilibrium Quasiparticle Dynamics in Graphene

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