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Université de Neuchâtel

First uncertainty evaluation of the FoCS-2 primary frequency standard

Jallageas, Antoine ; Devenoges, Laurent ; Petersen, M ; Morel, J ; Bernier, L. G ; Schenker, Dominique ; Thomann, Pierre ; Südmeyer, Thomas

In: Metrologia, 2018, vol. 55, no. 3, p. 366-385

We report the uncertainty evaluation of the Swiss continuous primary frequency standard FoCS-2 (Fontaine Continue Suisse). Unlike other primary frequency standards which are working with clouds of cold atoms, this fountain uses a continuous beam of cold caesium atoms bringing a series of metrological advantages and specific techniques for the evaluation of the uncertainty budget. Recent...

Université de Neuchâtel

Fungal biogenic patina : optimization of an innovative conservation treatment for copper-based artefacts

Albini, Monica ; Joseph, Edith (Dir.) ; Junier, Pilar (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

Microorganisms are often considered harmful for cultural heritage. However, they can also be used for its safeguarding. Indeed, some fungal species are known for their ability to produce oxalic acid in order to immobilize of toxic heavy metals and, therefore, detoxify their environmental. Biotechnology already exploited this ability to immobilize heavy metals in the field of waste treatment...

Bibliothèque cantonale jurassienne

Traces de dinosaures jurassiques : Courtedoux-Bois de Sylleux

Paratte, Géraldine ; Lapaire, Marielle ; Lovis, Christel ; Marty, Daniel

Porrentruy : Office de la culture, Paléontologie A16, 2018

(Catalogues du patrimoine paléontologique jurassien - A16)

ISBN: 9782884360470

Université de Fribourg

Circularly polarized reflection from the scarab beetle Chalcothea smaragdina: light scattering by a dual photonic structure

McDonald, Luke T. ; Finlayson, Ewan D. ; Wilts, Bodo D. ; Vukusic, Pete

In: Interface Focus, 2017, vol. 7, no. 4, p. 20160129

Helicoidal architectures comprising various polysaccharides, such as chitin and cellulose, have been reported in biological systems. In some cases, these architectures exhibit stunning optical properties analogous to ordered cholesteric liquid crystal phases. In this work, we characterize the circularly polarized reflectance and optical scattering from the cuticle of the beetle Chalcothea...

Université de Neuchâtel

Numerical simulations and uncertainty analysis for assessing spatial and temporal dynamics in alluvial river-aquifer systems : an application in the context of the 3rd Rhône River Correction

Gianni, Guillaume ; Brunner, Philip (Dir.) ; Perrochet, Pierre (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

Characterizing river-groundwater interactions in alluvial aquifers is essential when forecasting the impact of river management strategies, such as river restorations, on the overall water resources distribution and dynamics. Therefore, the development of methods and calibration approaches that allow for better identification of the spatial and temporal characteristics of the hydraulic properties...

Université de Fribourg

Collective iteration behavior for online social networks

Liu, Jian-Guo ; Li, Ren-De ; Guo, Qiang ; Zhang, Yi-Cheng

In: Physica A: Statistical Mechanics and its Applications, 2018, vol. 499, p. 490–497

Understanding the patterns of collective behavior in online social network (OSNs) is critical to expanding the knowledge of human behavior and tie relationship. In this paper, we investigate a specific pattern called social signature in Facebook and Wiki users’ online communication behaviors, capturing the distribution of frequency of interactions between different alters over time in the...

Université de Fribourg

Ultrafast doublon dynamics in photoexcited $1T$-${\mathrm{TaS}}_{2}$

Ligges, M. ; Avigo, I. ; Gole?, Denis ; Strand, H. ?U.? R. ; Beyazit, Y. ; Hanff, K. ; Diekmann, F. ; Stojchevska, L. ; Kalläne, M. ; Zhou, P. ; Rossnagel, K. ; Eckstein, Martin ; Werner, Philipp ; Bovensiepen, U.

In: Physical Review Letters, 2018, vol. 120, no. 16, p. 166401

Strongly correlated materials exhibit intriguing properties caused by intertwined microscopic interactions that are hard to disentangle in equilibrium. Employing nonequilibrium time-resolved photoemission spectroscopy on the quasi-two- dimensional transition-metal dichalcogenide 1T-TaS2, we identify a spectroscopic signature of doubly occupied sites (doublons) that reflects fundamental Mott...

Université de Fribourg

Nonthermal switching of charge order: Dynamical slowing down and optimal control

Schüler, Michael ; Murakami, Yuta ; Werner, Philipp

In: Physical Review B, 2018, vol. 97, no. 15, p. 155136

We investigate the laser-induced dynamics of electronically driven charge-density- wave (CDW) order. A comprehensive mean-field analysis of the attractive Hubbard model in the weak-coupling regime reveals ultrafast switching and ultrafast melting of the order via a nonthermal pathway. The resulting nonequilibrium phase diagram exhibits multiple distinct regimes of the order parameter dynamics...

Université de Fribourg

Enhanced pairing susceptibility in a photodoped two-orbital Hubbard model

Werner, Philipp ; Strand, Hugo U. R. ; Hoshino, Shintaro ; Murakami, Yuta ; Eckstein, Martin

In: Physical Review B, 2018, vol. 97, no. 16, p. 165119

Local spin fluctuations provide the glue for orbital-singlet spin-triplet pairing in the doped Mott insulating regime of multiorbital Hubbard models. At large Hubbard repulsion U, the pairing susceptibility is nevertheless tiny because the pairing interaction cannot overcome the suppression of charge fluctuations. Using nonequilibrium dynamical mean field simulations of the two-orbital...