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For a particle in a one-dimensional random potential all eigenstates are localized (Anderson localization). Interplay between interactions and disorder can lead to a localization-delocalization transition: in disordered bosonic fluids, the ground state is either a superfluid or in a localized phase called Bose glass. The associated phase diagram is well understood, but there is little study of the precise properties of the Bose-glass phase. Using a functional implementation of the Renormalization Group, I will describe the Bose-glass phase and some of its glassy properties linked to the existence of metastable states. I will then discuss the chaotic behavior of the Bose glass, i.e. its extreme sensitivity to external parameters. Finally, I will consider the effect of long-range interactions, which can induce a new disordered phase called Mott glass.

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Romain Daviet
Seminar Room, II Physics Institute
Contact: not specified