AI Article Synopsis
- The study focuses on the decay of highly excited ultracold fermions in a 3D optical lattice and explores the dynamics of doubly occupied sites (doublons) created in a repulsive Fermi-Hubbard system.
- The researchers observed that the lifetime of these doublons varies significantly and is influenced by the interaction energy compared to the kinetic energy, showing an exponential relationship.
- Additionally, they suggest that relaxation mainly occurs through a simultaneous many-body process, and their calculations using diagrammatic methods align well with the experimental data.
Article Abstract
We investigate the decay of highly excited states of ultracold fermions in a three-dimensional optical lattice. Starting from a repulsive Fermi-Hubbard system near half filling, we generate additional doubly occupied sites (doublons) by lattice modulation. The subsequent relaxation back to thermal equilibrium is monitored over time. The measured absolute doublon lifetime covers 2 orders of magnitude. In units of the tunneling time h/J it is found to depend exponentially on the ratio of on-site interaction energy U to kinetic energy J. We argue that the dominant mechanism for the relaxation is a simultaneous many-body process involving several single fermions as scattering partners. A many-body calculation is carried out using diagrammatic methods, yielding fair agreement with the data.
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| http://dx.doi.org/10.1103/PhysRevLett.104.080401 | DOI Listing |
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