In: Nature Communications, 2019, vol. 10, no. 1, p. 5556
An elusive goal in the field of driven quantum matter is the induction of long-range order. Here, we propose a mechanism based on light-induced evaporative cooling of holes in a correlated fermionic system. Since the entropy of a filled narrow band grows rapidly with hole doping, the isentropic transfer of holes from a doped Mott insulator to such a band results in a drop of temperature....
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In: Journal of Analytical Atomic Spectrometry, 2019, vol. 34, no. 11, p. 2325–2332
We report on novel reference-free methods to determine the instrumental resolution of transmission-type bent crystal spectrometers. The novel methods are based on the measurements of a selected X-ray line in several orders of diffraction. It is shown that the angular broadening of the spectrometer and the natural linewidth of the selected transition can be obtained directly from the novel...
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In: X-Ray Spectrometry, 2019, vol. 48, no. 5, p. 351–359
We report on measurements of the Kβ diagram, valence‐to‐core (VtC), and hypersatellite X‐ray spectra induced in metallic Cr by photon single and double K‐shell ionization. The experiment was carried out at the Stanford Synchrotron Radiation Lightsource using the seven‐crystal Johann‐type hard X‐ray spectrometer of the beamline 6‐2. For the Kβ diagram and VtC transitions, the...
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In: Review of Scientific Instruments, 2019, vol. 90, no. 6, p. 063106
The design and performance of a high-resolution transmission-type X-ray spectrometer for use in the 15–26 keV energy range at synchrotron light sources is reported. Monte Carlo X-ray-tracing simulations were performed to optimize the performance of the transmission-type spectrometer, based on the DuMond geometry, for use at the Super X-ray absorption beamline of the Swiss Light Source at...
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Thèse de doctorat : Université de Fribourg, 2017 ; no. 2052.
The present PhD thesis includes three different projects which belong to the domain of inner-shell atomic physics and high energy resolution X-ray spectroscopy. The first project consists of a series of in-house measurements of the characteristic K and L X-ray absorption spectra (XAS) of several 3d, 4d and 5d transition metals. For this project the target chamber of the von Hamos curved crystal...
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Thèse de doctorat : Université de Fribourg, 2016 ; no. 1995.
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In: Physical Review A, 2018, vol. 98, no. 1, p. 012705
We report on the radiative decay of double K-shell vacancy states produced in solid Ca, V, Fe, and Cu targets by impact with about 10 MeV/amu C and Ne ions. The resulting K hypersatellite x-ray emission spectra were measured by means of high- energy-resolution spectroscopy using a von Hamos bent crystal spectrometer. The experiment was carried out at the Philips variable energy cyclotron of...
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In: The European Physical Journal D, 2010, vol. 57, no. 2, p. 155-170
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In: Applied Physics B, 2007, vol. 87, no. 3, p. 539-546
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In: The European Physical Journal D, 2008, vol. 46, no. 1, p. 9-14
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