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Université de Fribourg

Floquet prethermalization in the resonantly driven Hubbard model

Herrmann, Andreas ; Murakami, Yuta ; Eckstein, Martin ; Werner, Philipp

In: EPL (Europhysics Letters), 2017, vol. 120, no. 5, p. 57001

We demonstrate the existence of long-lived prethermalized states in the Mott insulating Hubbard model driven by periodic electric fields. These states, which also exist in the resonantly driven case with a large density of photo-induced doublons and holons, are characterized by a nonzero current and an effective temperature of the doublons and holons which depends sensitively on the driving...

Université de Fribourg

Searching for axion stars and $Q$-balls with a terrestrial magnetometer network

Kimball, D. F. Jackson ; Budker, D. ; Eby, J. ; Pospelov, M. ; Pustelny, Szymon ; Scholtes, Theo ; Stadnik, Y. V. ; Weis, Antoine ; Wickenbrock, A.

In: Physical Review D, 2018, vol. 97, no. 4, p. 043002

Light (pseudo-)scalar fields are promising candidates to be the dark matter in the Universe. Under certain initial conditions in the early Universe and/or with certain types of self-interactions, they can form compact dark-matter objects such as axion stars or Q-balls. Direct encounters with such objects can be searched for by using a global network of atomic magnetometers. It is shown that...

Université de Fribourg

An arbitrary-function light power controller

Grujić, Zoran D. ; Piller, Jari ; Weis, Antoine

In: Review of Scientific Instruments, 2018, vol. 89, no. 2, p. 025114

We describe the design, applications, and performance of a simple light power controller. The device is built on a fiber-coupled electro-optic modulator with an active electronic feedback. It can be used to actively stabilize laser power or to impress an arbitrary waveform onto the power. The bandwidth of the device is ∼70 kHz.

Université de Fribourg

A comparative analysis of the predictive abilities of economic complexity metrics using international trade network

Liao, Hao ; Vidmer, Alexandre

In: Complexity, 2018, p. -

The complex networks approach has proven to be an effective tool to understand and predict the evolution of a wide range of complex systems. In this work, we consider the network representing the exchange of goods between countries: the international trade network. According to the type of goods they export, the complex networks approach allows inferring which countries will have a bigger...

Université de Fribourg

International Human Rights Law and Mirrors : A Tribute to Allen Buchanan

Besson, Samantha

In: ESIL Reflections (Internetzeitschrift) vom 16.04.2018, 2018, vol. 7, no. 2, p. 1-11

Université de Fribourg

Spectral properties from Matsubara Green’s function approach: Application to molecules

Schüler, Michel ; Pavlyukh, Y.

In: Physical Review B, 2018, vol. 97, no. 11, p. 115164

We present results for many-body perturbation theory for the one-body Green's function at finite temperatures using the Matsubara formalism. Our method relies on the accurate representation of the single-particle states in standard Gaussian basis sets, allowing to efficiently compute, among other observables, quasiparticle energies and Dyson orbitals of atoms and molecules. In particular, we...

Université de Fribourg

The cuticle mutant eca2 modifies plant defense responses to biotrophic and necrotrophic pathogens and herbivory insects

Blanc, Catherine ; Coluccia, Fania ; L?Haridon, Floriane ; Torres, Martha ; Ortiz-Berrocal, Marlene ; Stahl, Elia ; Reymond, Philippe ; Schreiber, Lukas ; Nawrath, Christiane ; Métraux, Jean-Pierre ; Serrano, Mario

In: Molecular Plant-Microbe Interactions, 2017, vol. 31, no. 3, p. 344–355

We isolated previously several Arabidopsis thaliana mutants with constitutive expression of the early microbe-associated molecular pattern–induced gene ATL2, named eca (expresión constitutiva de ATL2). Here, we further explored the interaction of eca mutants with pest and pathogens. Of all eca mutants, eca2 was more resistant to a fungal pathogen (Botrytis cinerea) and a bacterial pathogen...

Université de Fribourg

Mean first passage time of active Brownian particle in one dimension

Scacchi, Alberto ; Sharma, Abhinav

In: Molecular Physics, 2018, vol. 116, no. 4, p. 460–464

We investigate the mean first passage time of an active Brownian particle in one dimension using numerical simulations. The activity in one dimension is modelled as a two state model; the particle moves with a constant propulsion strength but its orientation switches from one state to other as in a random telegraphic process. We study the influence of a finite resetting rate r on the mean...