BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Monika Aidelsburger (LMU Munich) DTSTART:20210303T181500Z DTEND:20210303T194500Z DTSTAMP:20260423T035909Z UID:VSFLRC/8 DESCRIPTION:Title: U ltracold atoms in optical lattices out-of-equilibrium\nby Monika Aidel sburger (LMU Munich) as part of VSF Long Range Colloquium\n\n\nAbstract\nW ell-controlled synthetic quantum systems\, such as ultracold atoms in opti cal lattices\, offer intriguing possibilities to study complex many-body p roblems relevant to a variety of research areas\, ranging from condensed m atter to high-energy physics. In particular\, out-of-equilibrium phenomena constitute natural applications of quantum simulators\, which have alread y successfully demonstrated simulations in regimes that are beyond reach u sing state-of-the-art numerical techniques.\nThis enables us to shed new l ight on fundamental questions about the thermalization of isolated quantum many-body systems. While generic models are expected to thermalize accord ing to the eigenstate thermalization hypothesis (ETH)\, violation of ETH i s believed to occur mainly in two types of systems: integrable models and many-body localized systems. In between these two extreme limits there is\ , however\, a whole range of models that exhibit more complex dynamics\, f or instance\, due to an emergent fragmentation of the Hilbert space into m any dynamically disconnected subspaces. Here\, we realize such a model by implementing the 1D Fermi-Hubbard model with a strong linear potential [1] and observe strong initial-state dependent thermalization - a smoking-gun signature of Hilbert-space fragmentation.\nEngineering quantum systems ou t-of-equilibrium\, on the other hand\, further can be used as a tool to en gineer novel quantum phases of matter\, which cannot be accessed in static realizations. To this end\, the system’s parameters are varied periodic ally\, a method commonly known as Floquet engineering [2]. This facilitate d the realization of paradigmatic topological lattice models and recently inspired ideas for implementing Z2 lattice gauge theories [3]. The rich pr operties of topological Floquet systems\, however\, transcend those of the ir static counterparts\, resulting in a generalized bulk-edge corresponden ce. As a consequence\, topological edge modes can exist even in situations where the bulk bands have zero Chern numbers. The novel properties of suc h anomalous Floquet systems open the door to exciting new non- equilibrium many-body phases without any static analogue [4].\n\n[1] S. Scherg et al. \, arXiv:2010.12965 (2020)\n[2] A. Eckardt\, Phys. Mod. Phys. 89\, 311 (20 17)\n[3] C. Schweizer et al.\, Nat. Phys. 15\, 1168-1173 (2019)\n[4] K. Wi ntersperger et al.\, Nature Physics 16\, 1058-1063 (2020)\n LOCATION:https://researchseminars.org/talk/VSFLRC/8/ END:VEVENT END:VCALENDAR