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• W3099685816 abstract "We show that fermionic high-spin systems with spin-changing collisions allow one to monitor superexchange processes in optical superlattices with large amplitudes and strong spin fluctuations. By investigating the non-equilibrium dynamics, we find a superexchange dominated regime at weak interactions. The underlying mechanism is driven by an emerging tunneling-energy gap in shallow few-well potentials. As a consequence, the interaction-energy gap that is expected to occur only for strong interactions in deep lattices is re-established. By tuning the optical lattice depth, a crossover between two regimes with negligible particle number fluctuations is found: firstly, the common regime with vanishing spin-fluctuations in deep lattices and, secondly, a novel regime with strong spin fluctuations in shallow lattices. We discuss the possible experimental realization with ultracold 40K atoms and observable quantities in double wells and two-dimensional plaquettes." @default.
• W3099685816 created "2020-11-23" @default.
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• W3099685816 date "2013-11-11" @default.
• W3099685816 modified "2023-10-16" @default.
• W3099685816 title "Large-amplitude superexchange of high-spin fermions in optical lattices" @default.
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• W3099685816 doi "https://doi.org/10.1088/1367-2630/15/11/113017" @default.
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