Revealing hidden antiferromagnetic correlations in doped Hubbard chains via string correlators

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Science  04 Aug 2017:
Vol. 357, Issue 6350, pp. 484-487
DOI: 10.1126/science.aam8990

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Spin-charge separation in atomic chains

Strongly interacting electrons lined up along a string can experience the so-called spin-charge separation, where the electrons “split” into effective carriers of spin and charge, which then move independently. This phenomenon has been observed, somewhat indirectly, in solids. Hilker et al. show spin-charge separation in a direct way by using a one-dimensional (1D) array of cold atoms, playing the role of electrons, whose degrees of freedom of spin and charge can be monitored using a fermionic quantum gas microscope. Empty sites in the 1D lattice moved freely without disturbing the underlying antiferromagnetic order.

Science, this issue p. 484