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CCAST“液体物理和相关的问题”研讨会

作者： M.Baus physique des polymeres. Universite libre de bruxelles.campus plaine.CP 223.B-1050 Brussels.Belgium

＜正＞The freezing of hard-sphere mixtures of arbitrary polydispersity is studied within a van der Waals-type free-volume approximation. The present theory is simple enough to allow for a thorough numerical investigation of all the polydispersity effects on the order-disorder transition of hard spheres. Within this context we have studied the influence on the order-disorder transition of the initial preparation, the subsequent fractionation, and the possible terminal polydispersity. It is found that the order-disorder transition occupies a finite domain of the initial density-initial polydispersity plane and the frontier of this domain is determined. Considerable variation within this domain is found with respect to the initial density, while the influence of the specific form of the initial size-distribution is found to be only marginal. （?） 2003 American Institute of Physics. [DOI: 10.1063/1.1553760]

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Phase diagrams of poiydisperse van der Waals fluids

Phase diagrams of poiydisperse van der Waals fluids

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CCAST“液体物理和相关的问题”研讨会

作者： L.Bellier-Castella H.Xu M.Baus departement de physique des Materiaur（UMR 5586 du CNRS）.Universite Claude Bernard-Lyonl.69622 Villeurbanne Cedex.France departement de physique des Materiaur（UMR 5586 du CNRS）.Universite Claude Bernard-Lyonl.69622 Villeurbanne Cedex.France physique des polymeres.universile libre de bruxelles.campus plaine CP 223.B-1050 Brussels.Belgium

＜正＞The phase behavior of a system composed of spherical particles with a monomodal size distribution is investigated theoretically within the context of the van der Waals approximation for polydisperse fluids. It is shown how the binodals, spinodals, cloud-point and shadow curves as well as all the （polydispersity induced） critical points can be obtained for a variety of interaction potentials. The polydispersity induced modifications of the phase diagram （even for a polydispersity index / as small as I- 1.01） should be observable in some colloidal dispersions. （?） 2000 American Institute of Physics. [S0021 -9606（00）51842-X]

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Interfaces of polydisperse fluids: Surface tension and adsorption properties

Interfaces of polydisperse fluids: Surface tension and adsor...

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CCAST“液体物理和相关的问题”研讨会

作者： L.Bellier-Castella M.Baus departement de physique des Materiaux（UMR 5586 du CNRS）.Universite Claude Bernard-Lyonl.69622 Villeurbanne Cedex.France physique des polymeres.Universite libre de bruxelles.campus plaine.CP 223.B-1050 Brussels.Belgium

＜正＞We consider a system of spherical colloidal particles with a size polydispersity and use a simple van der Waals description in order to study the combined effect of both the polydispersity and the spatial nonuniformity induced by a planar interface between a low-density fluid phase （enriched in small particles） and a high-density fluid phase （enriched in large particles）. We find a strong adsorption of small particles at the interface, the latter being broadened with respect to the monodisperse case. We also find that the surface tension of the polydis-perse system results from a competition between the tendency of the polydispersity to lower the surface tension and its tendency to raise the critical-point temperature （i.e., its tendency to favor phase separation） with the former tendency winning at low temperatures and the latter at the higher temperatures.

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Direct observation of photonic Landau levels and helical edge states in strained honeycomb lattices

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Light(Science & Applications) 2020年第1期9卷 627-636页

作者： Omar Jamadi Elena Rozas Grazia Salerno Marijana Milicevic Tomoki Ozawa Isabelle Sagnes Aristide Lemaitre Luc Le Gratiet Abdelmounaim Harouri Iacopo Carusotto Jacqueline Bloch Alberto Amo Universite de Lille CNRSUMR 8523—PhLAM—Physique des Lasers Atomes et Molecules59000 LilleFrance depto.de Fisica de Materiales e Instituto Nicolas Cabrera Universidad Autonoma de Madrid(UAM)28049 MadridSpain Center for Nonlinear Phenomena and Complex Systems Universite Libre de BruxellesCP 231Campus PlaineB-1050 BrusselsBelgium Universite Paris-Saclay CNRSCentre de Nanosciences et de Nanotechnologies91120 PalaiseauFrance Interdisciplinary Theoretical and Mathematical Sciences Program(iTHEMS) RIKENWakoSaitama 351-0198Japan INO-CNR BEC Center and Dipartimento di Fisica Universita di Trento38123 PovoItaly

We report the realization of a synthetic magnetic field for photons and polaritons in a honeycomb lattice of coupled semiconductor micropillars.A strong synthetic field is induced in both the s and p orbital bands by engineering a uniaxial hopping gradient in the lattice,giving rise to the formation of Landau levels at the Dirac *** provide direct evidence of the sublattice symmetry breaking of the lowest-order Landau level wavefunction,a distinctive feature of synthetic magnetic *** realization implements helical edge states in the gap between n=0 and n=±1 Landau levels,experimentally demonstrating a novel way of engineering propagating edge states in photonic *** light of recent advances in the enhancement of polariton–polariton nonlinearities,the Landau levels reported here are promising for the study of the interplay between pseudomagnetism and interactions in a photonic system.

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