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Theses

Gaz de bosons et de fermions condensés : phases de Fulde-Ferrell-Larkin-Ovchinnikov et quasicondensats

Abstract : The first part of this thesis deals with inhomogeneous FFLO
phases. These phases can appear in superconductors or in cold atomic
gases in the presence of an homogeneous chemical potential difference
between the two spin species.
We look at the competition between the various phases close to
the transition line. In 2D, we use a Ginzburg-Landau
approach in order to predict a cascade of first-order transitions
between inhomogeneous phases with increasing complexity.
In 3D where the FFLO transition is a first order transition,
we present a numerical method to handle the Eilenberger quasiclassical
equations, which makes use of a Fourier expansion.
Then we determine the stablest inhomogeneous phases.

In the second part of this thesis, we extend the perturbative
Bogoliubov theory to quasicondensates using a phase-density
representation. We obtain predictions for different observables.
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https://tel.archives-ouvertes.fr/tel-00005472
Contributor : Christophe Mora Connect in order to contact the contributor
Submitted on : Monday, March 29, 2004 - 12:13:22 PM
Last modification on : Wednesday, November 17, 2021 - 12:26:39 PM
Long-term archiving on: : Friday, April 2, 2010 - 9:01:09 PM

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  • HAL Id : tel-00005472, version 1

Citation

Christophe Mora. Gaz de bosons et de fermions condensés : phases de Fulde-Ferrell-Larkin-Ovchinnikov et quasicondensats. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2004. Français. ⟨tel-00005472⟩

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