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dc.contributor.authorMancois, Vincenten_US
dc.identifier.citationMancois, V. (2018). Non-equilibrium long-range phase transition in cold atoms : theory and experiment. Doctoral thesis, Nanyang Technological University, Singapore.en_US
dc.description.abstractWe study the long-range force arising from the absorption of non-saturating laser beams in a two-dimensional cloud of cold atoms. The force created by the lasers is attractive and similar to the usual Newtonian gravity along the beam. The cloud is composed of bosonic strontium 88 cooled and trapped on the intercombination line. Transferring the atoms in a two-dimensional optical dipole trap in a magical wavelength configuration, a canonical non-equilibrium phase transition is expected. Below a critical temperature, selfgravitating particles in two dimensions can collapse, nearly by the same mechanism stars are forming. We observed experimentally transient compressions, a halfway satisfactory result originating from the power limitation of our dipole trap. The second part of the thesis focuses on the theoretical realization a minimal Brownian motor within a system of trapped particles in 2D, similarly to our experimental situation. The phenomenon characterizing the Brownian motor is the appearance of a macroscopic current of particles. We have shown that this direct transport of particles is independent of the details of the trapping potential and obtained if and only if two symmetries are jointly broken: By the presence of two heat baths along orthogonal directions together and an anisotropic trap misaligned from the temperature axes.en_US
dc.publisherNanyang Technological Universityen_US
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).en_US
dc.titleNon-equilibrium long-range phase transition in cold atoms : theory and experimenten_US
dc.typeThesis-Doctor of Philosophyen_US
dc.contributor.supervisor[Supervisor not in the list]en_US
dc.contributor.schoolSchool of Materials Science & Engineeringen_US
dc.description.degreeDoctor of Philosophyen_US
dc.contributor.organizationSorbonne Universityen_US
dc.contributor.supervisor2Pascal Vioten_US
dc.contributor.supervisor2David Wilkowskien_US
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