Hazel Olsen - Interaction induced Anderson transition in a kicked one dimensional Bose gas
The quantum kicked rotor is a Floquet system with a rich phenomenology, including dynamical localisation, which is analogous to Anderson localisation but in momentum space. We study the Lieb-Liniger model of one-dimensional bosons subjected to periodic kicks in the finite interacting limit. For both the non-interacting and strongly interacting (Tonks-Girardeau) limits, dynamical localization is the rule, leading to energy saturation at long times. However, for finite interactions with three particles or more, we identify a transition from an insulating to a metallic phase at a critical kicking strength. To demonstrate this we establish a formal correspondence between the dynamical evolution of an N particle Lieb-Liniger gas and an Anderson model in N spatial dimensions using the Bethe Ansatz solution. We then perform extensive numerical simulations and finite-time scaling analysis to confirm the transition towards delocalization, showing that this transition belongs to the orthogonal Anderson universality class.
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Lucas Sarrazin - Characterization of nonlinear effects in a Kerr Gires-Tournois Interferometer
Optical frequency Combs (OFCs) are sources of light characterized by a spectrum composed of multiple and equidistant spectral lines. Since their first development for optical frequency synthesis and metrology applications, novel OFC technologies are now required for wavelength division multiplexing in telecommunication systems, or for dual-comb ranging and spectroscopy. For these last two applications, intense research is devoted to the development of optical systems able to support the coexistence of OFCs from a single source.
In this presentation I will describe a novel planar semiconductor-based platform for the generation of multiple OFCs, consisting of a nonlinear Kerr Gires-Tournois (KGTI) micro-cavity placed inside an external resonator. By engineering the external cavity properties, this platform could be exploited for the exploration of Kerr spatio-temporal dynamics of OFCs, and potentially the emission of multiple combs. In this talk, I will provide an overview of the KGTI platform and focus on the experimental characterization of the nonlinear properties of the optical system.
