Spin transport in a Mott insulator of ultracold fermions
Author(s)
Nichols, Matthew A; Cheuk, Lawrence W; Okan, Melih; Hartke, Thomas R; Mendez, Enrique; Senthil, T; Khatami, Ehsan; Zhang, Hao; Zwierlein, Martin W; ... Show more Show less
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© 2019 American Association for the Advancement of Science.All right reserved. Strongly correlated materials are expected to feature unconventional transport properties, such that charge, spin, and heat conduction are potentially independent probes of the dynamics. In contrast to charge transport, the measurement of spin transport in suchmaterials is highly challenging.We observed spin conduction and diffusion in a system of ultracold fermionic atoms that realizes the half-filled Fermi-Hubbard model. For strong interactions, spin diffusion is driven by super-exchange and doublon-hole-assisted tunneling, and strongly violates the quantum limit of charge diffusion.The technique developed in this work can be extended to finite doping, which can shed light on the complex interplay between spin and charge in the Hubbard model.
Date issued
2019Department
Massachusetts Institute of Technology. Department of Physics; MIT-Harvard Center for Ultracold Atoms; Massachusetts Institute of Technology. Research Laboratory of ElectronicsJournal
Science
Publisher
American Association for the Advancement of Science (AAAS)