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arXiv · 2401.05890

Supersolidity of dipolar Bose-Einstein condensates induced by coupling to fermions

Maciej Lewkowicz·Tomasz Karpiuk·Mariusz Gajda·Mirosław Brewczyk
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Abstract

We study a mixture of a repulsive dipolar condensate and a degenerate Fermi gas in a quasi-one-dimensional geometry. We demonstrate that the presence of fermions, which attract bosons, drastically changes the behavior of the dipolar condensate. For strong enough boson-fermion attraction, a dipolar Bose-Fermi droplet appears in the mixture, and as the attraction becomes stronger, a roton excitation develops in the Bogoliubov spectrum, leading to the formation of a supersolid, and eventually a crystal of isolated droplets. We describe the system by coupled extended Gross-Pitaevskii (bosons) and Hartree-Fock (fermions) equations. We study the excitation spectrum of the system and identify a number of Goldstone and Higgs modes in the supersolid regime.

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Maciej Lewkowicz, Tomasz Karpiuk, Mariusz Gajda, Mirosław Brewczyk. 2024-01-11. Supersolidity of dipolar Bose-Einstein condensates induced by coupling to fermions. https://doi.org/10.1103/physreva.111.l011301

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