Observation of Elastic Doublon Decay in the Fermi-Hubbard Model

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Observation of Elastic Doublon Decay in the Fermi-Hubbard Model

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Title: Observation of Elastic Doublon Decay in the Fermi-Hubbard Model
Author: Strohmaier, Niels; Greif, Daniel; Jördens, Robert; Tarruell, Leticia; Moritz, Henning; Esslinger, Tilman; Sensarma, Rajdeep; Pekker, David; Altman, Ehud; Demler, Eugene A.

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Citation: Strohmaier, Niels, Daniel Greif, Robert Jördens, Leticia Tarruell, Henning Moritz, Tilman Esslinger, Rajdeep Sensarma, David Pekker, Ehud Altman, and Eugene Demler. 2010. Observation of elastic doublon decay in the Fermi-Hubbard model. Physical Review Letters 104:080401.
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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 doublon lifetime covers two 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 high order scattering process involving several single fermions as scattering partners. A many-body calculation is carried out using diagrammatic methods, yielding good agreement with the data.
Published Version: doi:10.1103/PhysRevLett.104.080401
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:13421134
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