TY - JOUR
T1 - Exploring the Regime of Fragmentation in Strongly Tilted Fermi-Hubbard Chains
AU - Kohlert, Thomas
AU - Scherg, Sebastian
AU - Sala, Pablo
AU - Pollmann, Frank
AU - Hebbe Madhusudhana, Bharath
AU - Bloch, Immanuel
AU - Aidelsburger, Monika
N1 - Publisher Copyright:
© 2023 American Physical Society.
PY - 2023/1/6
Y1 - 2023/1/6
N2 - Intriguingly, quantum many-body systems may defy thermalization even without disorder. One example is so-called fragmented models, where the many-body Hilbert space fragments into dynamically disconnected subspaces that are not determined by the global symmetries of the model. In this Letter we demonstrate that the tilted one-dimensional Fermi-Hubbard model naturally realizes distinct effective Hamiltonians that are expected to support nonergodic behavior due to fragmentation, even at resonances between the tilt energy and the Hubbard on site interaction. We find that the effective description captures the observed dynamics in experimentally accessible parameter ranges of moderate tilt values. Specifically, we observe a pronounced dependence of the relaxation dynamics on the initial doublon fraction, which directly reveals the microscopic processes of the fragmented model. Our results pave the way for future studies of nonergodic behavior in higher dimensions.
AB - Intriguingly, quantum many-body systems may defy thermalization even without disorder. One example is so-called fragmented models, where the many-body Hilbert space fragments into dynamically disconnected subspaces that are not determined by the global symmetries of the model. In this Letter we demonstrate that the tilted one-dimensional Fermi-Hubbard model naturally realizes distinct effective Hamiltonians that are expected to support nonergodic behavior due to fragmentation, even at resonances between the tilt energy and the Hubbard on site interaction. We find that the effective description captures the observed dynamics in experimentally accessible parameter ranges of moderate tilt values. Specifically, we observe a pronounced dependence of the relaxation dynamics on the initial doublon fraction, which directly reveals the microscopic processes of the fragmented model. Our results pave the way for future studies of nonergodic behavior in higher dimensions.
UR - http://www.scopus.com/inward/record.url?scp=85146112704&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.130.010201
DO - 10.1103/PhysRevLett.130.010201
M3 - Article
C2 - 36669215
AN - SCOPUS:85146112704
SN - 0031-9007
VL - 130
JO - Physical Review Letters
JF - Physical Review Letters
IS - 1
M1 - 010201
ER -