SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 14: Many-Body Quantum Dynamics I (joint session DY/TT)
TT 14.2: Vortrag
Mittwoch, 29. September 2021, 14:00–14:15, H6
Quantum many-body scars in tilted Fermi-Hubbard chains — •Jean-Yves Desaules1, Ana Hudomal1,2, Christopher Turner1, and Zlatko Papić1 — 1School of Physics and Astronomy, University of Leeds, Leeds, United Kingdom — 2Institute of Physics Belgrade, University of Belgrade, Belgrade, Serbia
Motivated by recent observations of ergodicity breaking due to Hilbert space fragmentation in 1D Fermi-Hubbard chains with a tilted potential [Scherg et al., arXiv:2010.12965], we show that the same system also hosts quantum many-body scars in a regime U=Δ>J at electronic filling factor ν=1. We numerically demonstrate that the scarring phenomenology in this model is similar to other known realisations such as Rydberg atom chains, including persistent dynamical revivals and ergodicity-breaking many-body eigenstates. At the same time, we show that the mechanism of scarring in the Fermi-Hubbard model is different from other examples in the literature: the scars originate from a subgraph, representing a free spin-1 paramagnet, which is weakly connected to the rest of the Hamiltonian's adjacency graph. Our work demonstrates that correlated fermions in tilted optical lattices provide a platform for understanding the interplay of many-body scarring and other forms of ergodicity breaking, such as localisation and Hilbert space fragmentation.