Observation of Elastic Doublon Decay in the Fermi-Hubbard Model - Condensed Matter > Quantum GasesReport as inadecuate




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Abstract: We investigate the decay of highly excited states of ultracold fermions in athree-dimensional optical lattice. Starting from a repulsive Fermi-Hubbardsystem near half filling, we generate additional doubly occupied sitesdoublons by lattice modulation. The subsequent relaxation back to thermalequilibrium is monitored over time. The measured doublon lifetime covers twoorders of magnitude. In units of the tunneling time h-J it is found to dependexponentially on the ratio of on-site interaction energy U to kinetic energy J.We argue that the dominant mechanism for the relaxation is a high orderscattering process involving several single fermions as scattering partners. Amany-body calculation is carried out using diagrammatic methods, yielding goodagreement with the data.



Author: Niels Strohmaier, Daniel Greif, Robert Jördens, Leticia Tarruell, Henning Moritz, Tilman Esslinger, Rajdeep Sensarma, David Pekk

Source: https://arxiv.org/







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