Meson formation in doped antiferromagnets: From dynamics to pairing

Time:  10:30 (Taipei time)
Venue: Online Zoom [Registration] is required
Speaker: ‪Fabian Grusdt‬ (Ludwig-Maximilians-Universität München, Germany)
Title: Meson formation in doped antiferromagnets: From dynamics to pairing
Abstract: Recent experimental advances, both in solids as well as quantum simulators, allow unprecedented microscopic studies of the structure of strongly correlated quantum matter. In the Fermi-Hubbard model, believed to underly high-Tc superconductivity, this allows to revisit a decades-old idea that strongly interacting electrons may fractionalize into partons — loosely speaking, the analogs of quarks in high-energy physics — called spinons and chargons. In this talk I will give an overview of recent theoretical and experimental results supporting this idea. A particular focus will be on dynamical signatures of meson formation in different experimentally relevant settings. First I will discuss multi-stage dynamics of quasiparticle formation when individual dopants are released from a pinning potential. I will show how the internal structure of the emerging charge carrier can be visualized by analyzing individual snapshots of the many-body wavefunction. In the second part of the talk, I will go beyond a single charge carrier and present a strong string-based pairing mechanism of holes which has recently led to the direct observation of hole-pairing in ultracold atoms. Finally I will discuss spectroscopic signatures of meson formation which provide a promising direction for future experiments, further extending the unprecedented microscopic insights into strongly correlated quantum matter afforded by quantum simulation experiments. 

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