Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session A33: Disorder and Localization in AMO Systems
8:00 AM–11:00 AM,
Monday, March 14, 2022
Room: McCormick Place W-192C
Sponsoring
Units:
DAMOP DCMP
Chair: Mohammad-Ali Miri, Queen's College
Abstract: A33.00007 : Non-ergodicity and emergent Hilbert-space fragmentation in tilted Fermi-Hubbard chains
9:12 AM–9:48 AM
Presenter:
Monika Aidelsburger
(Ludwig-Maximilians-Universitaet (LMU-Munich))
Author:
Monika Aidelsburger
(Ludwig-Maximilians-Universitaet (LMU-Munich))
The 1D tilted Fermi-Hubbard model has emerged as a versatile platform to study a rich variety of weak ergodic-breaking phenomena in a clean system without disorder. We have realized this model with fermionic K-atoms and observed a surprisingly robust memory of the initial state over a wide range of parameters [1], which we explain via emergent kinetic constraints. Our measurements were performed in systems of about 290 lattice sites for up to 700 tunneling times - a regime that is currently not accessible with state-of-the-art numerical techniques. We have used these results to benchmark a novel more efficient numerical technique [2]. Moreover, in the large-tilt regime the observed non-ergodic behavior is explained by an emergent fragmentation of the many-body Hilbert space into an exponential number of dynamically disconnected subspaces [3]. The experimental realization of this regime paves the way for future studies at the interface of MBL and weak-ergodicity breaking phenomena in one- and two-dimensions.
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