Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 48: Ultra-cold Atoms, Ions and BEC III (joint session A/Q)
Q 48.4: Vortrag
Donnerstag, 14. März 2024, 15:15–15:30, HS 1010
Repulsively-bound pair states in the 1D extended Hubbard model — •Pascal Weckesser1,2, Kritsana Srakaew1,2, David Wei1,2, Daniel Adler1,2, Suchita Agrawal1,2, Immanuel Bloch1,2,3, and Johannes Zeiher1,2 — 1Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — 2Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany — 3Fakultät für Physik, Ludwig-Maximilians-Universität, 80799 Munich, Germany
The binding between two particles is usually mediated by attractive forces. Operating in an external confinement however, one can observe pair-binding despite having repulsive interactions. The existence of such bound states has been conjectured for the one-dimensional extended Hubbard model, yet so far their observation remained elusive.
In this talk, we present our recent findings on realizing one-dimensional extended Hubbard systems for 87Rb atoms trapped in optical lattices and explore the emerging exotic bound states. Here, the long-range repulsion between two adjacent lattices sites is engineered using stroboscopic Rydberg dressing. We probe the presence of the bound state by monitoring the out-of-equilibrium dynamics of two particles using our quantum gas microscope, giving us direct access to the evolution of the density and the underlying correlations. As a final measurement, we explore multiparticle binding between three atoms. Our results path the way to study complex extended Hubbard models and string breaking in spin chains.
Keywords: Experimental quantum simulation; Extended Hubbard model; Rydberg dressing; Rydberg systems; Optical lattices