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arXiv · 1711.00057

Quantum phases of spinful Fermi gases in optical cavities

E. Colella·R. Citro·M. Barsanti·D. Rossini·M. L. Chiofalo
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Abstract

We explore the quantum phases emerging from the interplay between spin and motional degrees of freedom of a one-dimensional quantum fluid of spinful fermionic atoms, effectively interacting via a photon-mediating mechanism with tunable sign and strength g, as it can be realized in present-day experiments with optical cavities. We find the emergence, in the very same system, of spin- and atomic-density wave ordering, accompanied by the occurrence of superfluidity for g > 0, while cavity photons are seen to drive strong correlations at all g values, with fermionic character for g > 0, and bosonic character for g < 0. Due to the long-range nature of interactions, to infer these results we combine mean-field and exact diagonalization methods supported by bosonization analysis.

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E. Colella, R. Citro, M. Barsanti, D. Rossini, M. L. Chiofalo. 2017-10-31. Quantum phases of spinful Fermi gases in optical cavities. https://doi.org/10.1103/physrevb.97.134502

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