- strong Anderson localization
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The wave interferences may prevent waves to propagate: this is the strong Anderson localization. We investigate – analytically and numerically – this phenomenon for acoustical waves, light, micro-waves and cold atoms, in strong collaboration with experimentalists.
Participants : A. Minguzzi, V. Rossetto, S. Skipetrov, B. van Tiggelen |
- seismology & acoustics
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Mesoscopic methods are applied to acoustical and elastic waves untill seismical scale. We investigate transport and waves fluctuations, in comparison with experimental data.
Participants : B. van Tiggelen |
- quantum optics
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We work on the modelization of disordered media with gain notably the "random laser" effect and the fluctuations due to the quantum origin of photons. A project about the fluctuations of vacuum under a magnetic field has started.
Participants : S. Skipetrov, B. van Tiggelen |
- quantum gases
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Quantum gases are model systems where interactions and geometry can be tuned. This opens fascinating perspectives for theorists to investigate various low-dimensional models, correlations effects and out-of-equilibrium properties.
Participants : F. Hekking, A. Minguzzi, P. Schuck, S. Skipetrov, B. van Tiggelen |
- nano-electromechanics
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We study quantum and classical transport properties of electrons in nanometric mechanical systems (Nano Electro Mechanicals Systems). Electronic transport at this scale is strongly coupled to mechanical motion through the Coulombian interaction and gives rise to new physical phenomena. Potential applications of these systems as rapid and ultrasensitive probes are also very important.
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- heat flow in mesoscopic systems
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We are studying heat flow in mesoscopic systems at sub-Kelvin temperatures, with a particular interest in thermo-electric cooling. Heat is carried by electrons (sometimes in the form of Cooper pairs if superconductivity is present), phonons and photons. In such nanometre scale systems, new physics emerges when any of these heat carriers exhibit quantum coherence or are confined into discrete quantum states.
Participants : F. Hekking, R. Whitney |
- statistical physics out of equilibrium
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The theoretical description of non-equilibrium phenomena often represents a problem, since many of the universal tools of the equilibrium statistical physics cannot be applied. An example of a non-equilibrium phase transition in a quantum system is the Bose-condensation of microcavity polaritons, which have a finite radiative decay rate, so their stationary state exists only under external pumping. Classical statistical models, such as reaction-diffusion processes or moving interfaces, exhibit a rich variety of non-equilibrium critical phenomena whose theoretical investigation requires the development of new approaches.
Participants : L. Canet, A. Minguzzi |
- magnetism in low dimensions
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The systems of low dimension show unusual – even exotic – quantum magnetic phases offen induced by the presence of strong correlations. We are interested in the phenomenon of orbital magnetism (quantum Hall effect) in two-dimensional electron gases as well as in the phenomenon of spin magnetism in various systems (electron gases doped by magnetic impurities, organic conductors, frustrated magnetic systems, etc.). Participants : L. Canet, T. Champel, R. Whitney, T. Ziman |
- polarization transport and anisotropies
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When they propagate, the waves polarization modes are differently influenced by the media or diffusers anisotropies. This may be translated by the emergence of a geometric phase. To take into account these anomalies, we use the tools of the field theory and of quantum mechanics and numerical methods with a vue of applications in optics or seismology. Participants : V. Rossetto |
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