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- W2891902270 abstract "Effective range is a quantity to characterize the energy dependence in two-body scattering strength, and is widely used in cold atomic systems especially across narrow resonances. Here we show that the effective range can significantly modify the magnetic property of one-dimensional (1D) spin-$1/2$ fermions in the strongly repulsive regime. In particular, the effective range breaks the large spin degeneracy in the hard-core limit, and induces a Heisenberg exchange term in the spin chain that is much more sensitive to the local density than that induced by the bare coupling. With an external harmonic trap, this leads to a very rich magnetic pattern where the anti-ferromagnetic (AFM) and ferromagnetic (FM) correlations can coexist and distribute in highly tunable regions across the trap. Finally, we propose to detect the range-induced magnetic order in the tunneling experiment. Our results can be directly tested in 1D Fermi gases across narrow resonance, and suggest a convenient route towards the local manipulation of quantum magnetism in cold atoms." @default.
- W2891902270 created "2018-09-27" @default.
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- W2891902270 date "2019-01-10" @default.
- W2891902270 modified "2023-10-18" @default.
- W2891902270 title "Local manipulation of quantum magnetism in one-dimensional ultracold Fermi gases across narrow resonances" @default.
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- W2891902270 doi "https://doi.org/10.1103/physreva.99.013607" @default.
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