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Consortium of Swiss Academic Libraries

Dimensionality-reduced subspace clustering

Heckel, Reinhard ; Tschannen, Michael ; Bölcskei, Helmut

In: Information and Inference: A Journal of the IMA, 2017, vol. 6, no. 3, p. 246-283

Université de Fribourg

Post-protein binding metal-mediated coupling of an acridine orange-based fluorophore

Santoro, Giuseppe ; Blacque, Olivier ; Zobi, Fabio

In: Metallomics, 2012, vol. 4, no. 3, p. 253-259

The HEW lysozyme (Lys) and the fac-[Re(CO)3(H2O)3]+ complex (1) are used as a simple model system for the description of a new approach to the labelling polypeptides with fluorescent tags. The strategy takes advantage of the reaction of an acridine orange-based fluorophore (AO) with the non-native metal fragment 1 hybridized on the enzyme. A synthetic methodology for the quantitative...

Université de Fribourg

Probing intraband excitations in ${\mathrm{ZrTe}}_{5}$: A high-pressure infrared and transport study

Santos-Cottin, D. ; Padlewski, M. ; Martino, E. ; David, S. Ben ; Mardelé, F. Le ; Capitani, F. ; Borondics, F. ; Bachmann, M. D. ; Putzke, C. ; Moll, P. J. W. ; Zhong, R. D. ; Gu, G. D. ; Berger, H. ; Orlita, M. ; Homes, C. C. ; Rukelj, Z. ; Akrap, Ana

In: Physical Review B, 2020, vol. 101, no. 12, p. 125205

Zirconium pentatetelluride, ZrTe5, shows remarkable sensitivity to hydrostatic pressure. In this work we address the high-pressure transport and optical properties of this compound, on samples grown by flux and chemical vapor transport. The high-pressure resistivity is measured up to 2 GPa, and the infrared transmission up to 9 GPa. The dc conductivity anisotropy is determined using a...

Université de Fribourg

Thin-film structural coloration from simple fused scales in moths

Kilchoer, Cédric ; Steiner, Ullrich ; Wilts, Bodo D.

In: Interface Focus, 2019, vol. 9, no. 1, p. 20180044

The metallic colouration of insects often originates from diverse nanostructures ranging from simple thin films to complex three-dimensional photonic crystals. In Lepidoptera, structural colouration is widely present and seems to be abundant in extant species. However, even some basal moths exhibit metallic colouration. Here, we have investigated the origin of the vivid metallic colours of...

Université de Fribourg

Terahertz vortex beam as a spectroscopic probe of magnetic excitations

Sirenko, Andrei A. ; Maršík, Premysl ; Bernhard, Christian ; Stanislavchuk, T. N. ; Kiryukhin, V. ; Cheong, S.-W.

In: Physical Review Letters, 2019, vol. 122, no. 23, p. 237401

Circularly polarized light with spin angular momentum is one of the most valuable probes of magnetism. We demonstrate that light beams with orbital angular momentum (OAM), or vortex beams, can also couple to magnetism exhibiting dichroisms in a magnetized medium. Resonant optical absorption in a ferrimagnetic crystal depends strongly on both the handedness of the vortex and the direction of...

Université de Fribourg

Excited-state band mapping and momentum-resolved ultrafast population dynamics in In/Si(111) nanowires investigated with XUV-based time- and angle-resolved photoemission spectroscopy

Nicholson, Christopher W. ; Puppin, M. ; Lücke, A. ; Gerstmann, U. ; Krenz, M. ; Schmidt, W. G. ; Rettig, L. ; Ernstorfer, R. ; Wolf, M.

In: Physical Review B, 2019, vol. 99, no. 15, p. 155107

We investigate the excited state electronic structure of the model phase transition system In/Si(111) using femtosecond time- and angle-resolved photoemission spectroscopy (trARPES). An extreme ultraviolet 500 kHz laser source at 21.7 eV is utilized both to map the energy of excited states above the Fermi level and follow the momentum-resolved population dynamics on a femtosecond timescale....

Université de Fribourg

Distribution of polymer-coated gold nanoparticles in a 3D lung model and indication of apoptosis after repeated exposure

Chortarea, Savvina ; Fytianos, Kleanthis ; Rodriguez-Lorenzo, Laura ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara

In: Nanomedicine, 2018, vol. 13, no. 10, p. 1169–1185

Aim: The distribution and impact of aerosol-delivered gold nanoparticles (AuNPs) functionalized with a mixture of aminated-polyvinyl alcohol and amino-PEG ([polyvinyl alcohol/PEG]-NH2) upon repeated administration onto a 3D lung model were explored. Materials & methods: AuNPs were aerosolized and uptake and epithelial translocation was assessed by inductively coupled plasma optical-emission ...