Ref HAL: hal-01310551_v1
Ref Arxiv: 1602.04796
DOI: 10.1103/PhysRevLett.116.179801
WoS: 000374963700003
Ref. & Cit.: NASA ADS
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2 Citations
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In a recent Letter, Wang and Brady (WB) [1] analyse the rheology of Brownian hard spheres using constant stress and pressure Brownian dynamics simulations. The main observable is the shear viscosity, η( ̇γ,Π), expressed as a function of the shear rate ̇γ and adimensional pressure ̄Π = Πa3/(kBT), where Π is the pressure, kBT the thermal energy, and a the average particle diameter. The central conclusion is the discovery of a “universal viscosity divergence”

Commentaires: 1 page; under review

Ref HAL: hal-01310191_v1
DOI: 10.1103/PhysRevE.93.042602
WoS: WOS:000373585500004
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7 Citations
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We use molecular dynamics simulations to investigate dynamic heterogeneities and the potential energy landscape of the Gaussian core model (GCM). Despite the nearly Gaussian statistics of particles' displacements, the GCM exhibits giant dynamic heterogeneities close to the dynamic transition temperature. The divergence of the four-point susceptibility is quantitatively well described by the inhomogeneous version of the mode-coupling theory. Furthermore, the potential energy landscape of the GCM is characterized by large energy barriers, as expected from the lack of activated, hopping dynamics, and display features compatible with a geometric transition. These observations demonstrate that all major features of mean-field dynamic criticality can be observed in a physically sound, three-dimensional model.

Ref HAL: hal-01304303_v1
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Principles of formation of viral capsids with double protein shells

Résumé:

Physics of virus self-assembly and virus-like biological nanoparticles

Résumé:

Physics of Virus Self-Assembly

DOI: 10.1103/PhysRevB.93.115410
WoS: WOS:000371734300008
4 Citations
Résumé:

We report on the unusual and counterintuitive behavior of spin lifetime of excitons in coupled semiconductor quantum wells (CQWs) in the presence of in-plane magnetic field. Instead of conventional acceleration of spin relaxation due to the Larmor precession of electron and hole spins, we observe a strong increase of the spin relaxation time at low magnetic fields followed by saturation and decrease at higher fields. We argue that this nonmonotonic spin relaxation dynamics is a fingerprint of the magnetic quantum confined Stark effect. In the presence of electric field along the CQW growth axis, an applied magnetic field efficiently suppresses the exciton spin coherence, due to inhomogeneous broadening of the g-factor distribution.

Ref HAL: hal-01294277_v1
Ref Arxiv: 1510.07916
DOI: 10.1088/1742-5468/2016/03/033501
WoS: 000375704700040
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11 Citations
Résumé:

One possible framework to interpret the irreversibility transition observed in periodically driven colloidal suspensions is that of a non-equilibrium phase transition towards an absorbing reversible state at low amplitude of the driving force. We consider a simple numerical model for driven suspensions which allows us to characterize in great detail a large body of physical observables that can be experimentally determined to assess the existence and universality class of such a non-equilibrium phase transition. Characterizing the behaviour of static and dynamic correlation functions both in real and Fourier space we determine in particular several critical exponents for our model, which take values that are in good agreement with the universality class of direct ed percolation. We also provide a detailed analysis of single-particle and collective dynamics of the system near the phase transition, which appear intermittent and spatially correlated over diverging timescales and lengthscales, and provide clear signatures of the underlying criticality.

Commentaires: 27 pages, 12 figures; J. Stat. Mech. (in press)