M
F
Last name: MORTESSAGNE
First name: Fabrice
Email: Fabrice.MORTESSAGNE@univ-cotedazur.fr
Institution: UCA
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Le graphène, une feuille d'atomes de carbone disposés en nid d'abeille, est sans conteste le super-matériau du XXIe siècle. Il fait l'objet l'objet de toutes les attentions pour ses propriétés mécaniques, thermiques, électriques et optiques. Le transport électronique du graphène fascine également par sa capacité à rendre la physique des hautes...
International audience
Le graphène, une feuille d'atomes de carbone disposés en nid d'abeille, est sans conteste le super-matériau du XXIe siècle. Il fait l'objet l'objet de toutes les attentions pour ses propriétés mécaniques, thermiques, électriques et optiques. Le transport électronique du graphène fascine également par sa capacité à rendre la physique des hautes...
Au travers d'une sélection d'articles, ce document propose de suivre le parcours de l'auteur dans le vaste et riche domaine du chaos ondulatoire. L'accent est en particulier mis sur les activités expérimentales dont il a été l'initiateur, et qu'il anime actuellement. Le lecteur parcourra ainsi plusieurs ordres de grandeur de longueurs d'onde :...
International audience
Le CEMEF et le Laboratoire de Physique de la Matière Condensée ont initié et développé un projet de recherche visant à mettre au point des pigments naturels, stables, respectueux de l'environnement et de la santé. Fort de nombreuses applications industrielles potentielles, ce projet qui vient d'être primé par OSEO et le Ministère de...
This chapter is an introduction to the semiclassical approach for the Helmholtz equation in complex systems originating in the field of quantum chaos. A particular emphasis will be made on the applications of trace formulae in paradigmatic wave cavities known as wave billiards. Its connection with random matrix theory (RMT) and disordered...
We propose to revisit the diffusion of atoms in the Knudsen regime in terms of a complex dynamical reflection process. By means of molecular dynamics simulation we emphasize the asymptotic nature of the cosine law of reflection at the atomic scale, and carefully analyze the resulting strong correlations in the reflection events. A dynamical...
International audience
The description of open quantum system successfully uses the concept of the effective Hamiltonian, which takes into account the coupling to the environment. The concept can be extended to classical waves. Exper- imentally, classical waves are very convenient as they allow to control boundaries, coupling and absorption. We combine here recent...
In a 2D rectangular microwave cavity dressed with one point-like scatterer, a semiclassical approach is used to analyze the spectrum in terms of periodic orbits and diffractive orbits. We show, both numerically and experimentally, how the latter can be accounted for in the so-called length spectrum which is retrieved from 2-point correlations...
We experimentally study the widths of resonances in a two-dimensional microwave cavity at room temperature. By developing a model for thecoupling antennas, we are able to discriminate their contribution from those of ohmic losses to the broadening of resonances. Concerning ohmic losses, we experimentally put to evidence two mechanisms: damping...
In a two-dimensional microwave chaotic cavity ohmic losses located at the contour of the cavity result in different broadenings of different modes. We provide an analytic description and establish the link between such an inhomogeneous damping and the complex (non-real) character of biorthogonal wave functions. This substantiates the...
In this letter, we demonstrate that a non-Hermitian Random Matrix description can account for both spectral and spatial statistics of resonance states in a weakly open chaotic wave system with continuously distributed losses. More specifically, the statistics of resonance states in an open 2D chaotic microwave cavity are investigated by solving...
In a two-dimensional microwave chaotic cavity ohmic losses located at the contour of the cavity result in different broadenings of different modes. We provide an analytic description and establish the link between such an inhomogeneous damping and the complex (non-real) character of biorthogonal wave functions. This substantiates the...
The possibility of using hexagonal structures in general and graphene in particular to emulate the Dirac equation is the basis of our considerations. We show that Dirac oscillators with or without restmass can be emulated by distorting a tight binding model on a hexagonal structure. In a quest to make a toy model for such relativistic equations...
We experimentally study the various manifestations of ohmic losses in a two-dimensional microwave chaotic cavity and exhibit two different contributions to the resonance widths. We show that the parts of these widths, which vary from mode to mode, are associated to ohmic losses located at the boundary of the cavity. We also describe how this...
In this letter, we demonstrate that a non-Hermitian Random Matrix description can account for both spectral and spatial statistics of resonance states in a weakly open chaotic wave system with continuously distributed losses. More specifically, the statistics of resonance states in an open 2D chaotic microwave cavity are investigated by solving...
Electromagnetic reverberation chambers (RC) are nowadays commonly used for electromagnetic immunity testing applications. Thanks to the presence of a mechanical stirrer (generally a rotating metallic object), electronic devices under test are submitted to an isotropic, statistically uniform and depolarised electromagnetic field. The latter...