Revealing hidden antiferromagnetic correlations in doped Hubbard chains via string correlators

• Autores: Timon A. Hilker, Guillaume Salomon, Fabian Grusdt
• Localización: Science, ISSN 0036-8075, Vol. 357, Nº 6250, 2017, págs. 484-487
• Idioma: inglés
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• Resumen

  • Topological phases, like the Haldane phase in spin-1 chains, defy characterization through local order parameters. Instead, nonlocal string order parameters can be employed to reveal their hidden order. Similar diluted magnetic correlations appear in doped one-dimensional lattice systems owing to the phenomenon of spin-charge separation. Here we report on the direct observation of such hidden magnetic correlations via quantum gas microscopy of hole-doped ultracold Fermi-Hubbard chains. The measurement of nonlocal spin-density correlation functions reveals a hidden finite-range antiferromagnetic order, a direct consequence of spin-charge separation. Our technique, which measures nonlocal order directly, can be readily extended to higher dimensions to study the complex interplay between magnetic order and density fluctuations.