Spin-charge separation in a one-dimensional Fermi gas with tunable interactions

Ruwan Senaratne, Danyel Cavazos-Cavazos, Sheng Wang, Feng He, Ya Ting Chang, Aashish Kafle, Han Pu, Xi Wen Guan*, Randall G. Hulet*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)

    Abstract

    Ultracold atoms confined to periodic potentials have proven to be a powerful tool for quantum simulation of complex many-body systems. We confine fermions to one dimension to realize the Tomonaga-Luttinger liquid model, which describes the highly collective nature of their low-energy excitations. We use Bragg spectroscopy to directly excite either the spin or charge waves for various strengths of repulsive interaction. We observe that the velocity of the spin and charge excitations shift in opposite directions with increasing interaction, a hallmark of spin-charge separation. The excitation spectra are in quantitative agreement with the exact solution of the Yang-Gaudin model and the Tomonaga-Luttinger liquid theory. Furthermore, we identify effects of nonlinear corrections to this theory that arise from band curvature and back-scattering.

    Original languageEnglish
    Pages (from-to)1305-1308
    Number of pages4
    JournalScience
    Volume376
    Issue number6599
    DOIs
    Publication statusPublished - 17 Jun 2022

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