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Experimental realization of fragmented models in tilted Fermi-Hubbard chains

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What are the questions raised by this paper?

AI: The text does not mention any questions raised by the paper. It mainly discusses the topic of quantum many-body systems and their non-ergodicity caused by fragmentation of the Hilbert-space, and the use of the tilted one-dimensional Fermi-Hubbard model to study this phenomenon using ultracold fermions. The paper presents experimental results on the doublon-number dependence of these emergent microscopic processes.

Authors

Thomas Kohlert, Sebastian Scherg, Pablo Sala, Frank Pollmann, Bharath Hebbe Madhusudhana, Immanuel Bloch, Monika Aidelsburger

Abstract

Quantum many-body systems may defy thermalization even without disorder. Intriguingly, non-ergodicity may be caused by a fragmentation of the many-body Hilbert-space into dynamically disconnected subspaces. The tilted one-dimensional Fermi-Hubbard model was proposed as a platform to realize fragmented models perturbatively in the limit of large tilt. Here, we demonstrate the validity of this effective description for the transient dynamics using ultracold fermions. The effective analytic model allows for a detailed understanding of the emergent microscopic processes, which in our case exhibit a pronounced doublon-number dependence. We study this experimentally by tuning the doublon fraction in the initial state.

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What is the difference between this paper and https://arxiv.org/abs/2010.12965 by the same group?

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