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October, 1st
December, 10th

Quantum Simulation with Ultracold Atoms – From Hubbard Models to Gauge Theories

July 22nd, 2021 MONIKA AIDELSBURGER Ludwig-Maximilians University Munich

I received my PhD in 2015 on “Artificial gauge fields with ultracold atoms in optical lattices” in the group of Prof. Immanuel Bloch at LMU in Munich. After a postdoc position at Collège de France in Paris in the group of Prof. Jean Dalibard, where we studied out-of-equilibrium phenomena with uniform Bose gases, I returned to LMU as a group leader in 2017. In 2018 I successfully applied for an ERC Starting grant from the European Union and since 2019 I am a tenure-track professor for Synthetic Quantum Matter at LMU. The main goal of my ERC project is the simulation of lattice gauge theories coupled to fermionic matter with ultracold Yb atoms. Abstract Well-controlled synthetic quantum systems, such as ultracold atoms in optical lattices, offer intriguing possibilities to study complex many-body problems in regimes that are beyond reach using state-of-the-art numerical techniques. This enables us, for instance, to shed new light on fundamental questions about the thermalization of isolated quantum many-body systems. Recently, a class of models has been identified that lies in between the extreme limits of thermal and localizing behaviour. Here ergodicity-breaking occurs due to an emergent fragmentation of the many-body Hilbert space. A versatile platform that paves the way towards studying these phenomena is the 1D Fermi-Hubbard model with a strong linear potential.

During the last years the range of accessible condensed matter model Hamiltonians has been extended towards topological systems. One important ingredient was the realization of artificial gauge fields via the technique of periodic driving, also known as Floquet engineering, which further allows the realization of genuine out-ofequilibrium topological phases that do not have any static counterpart. The success of Floquet engineering triggered new efforts among experimentalists to build on this vast toolbox and realize non-trivial matter-gauge couplings– a central ingredient for the simulation of so-called lattice gauge theories (LGTs). LGTs play a fundamental role in a variety of areas including high-energy physics and topological quantum computation. So far successful experimental implementations, however, were limited to small building blocks of few sites due to the complex local structure of the theory.

We are currently developing a new scheme based on correlated tunneling of fermionic atoms and local state-dependent control using optical tweezers to realize a scalable platform for the simulation of U(1) LGTs, relevant for quantum electrodynamics.

All interested may join this session. Participants will be asked to register upon entry. After registering, you will receive a confirmation email containing information and the link to join in.

Colloquium, July 22, 2021, 11:00. Online (Zoom)

Hosted by Prof Lluis Torner