Self-induced Josephson oscillations and self-trapping in a supersolid dipolar quantum gas

• URL: http://arxiv.org/abs/2501.17142v2
• Date: Mon, 03 Feb 2025 23:44:05 GMT
• Title: Self-induced Josephson oscillations and self-trapping in a supersolid dipolar quantum gas
• Authors: Beatrice Donelli, Nicolò Antolini, Giulio Biagioni, Marco Fattori, Andrea Fioretti, Carlo Gabbanini, Massimo Inguscio, Luca Tanzi, Giovanni Modugno, Augusto Smerzi, Luca Pezzè,
• Abstract summary: We show theoretically that supersolids feature all the standard properties of bosonic Josephson junction arrays. Our work shades new light on the dynamics of supersolids and opens the way to the study of a novel class of Josephson junctions.
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• Abstract: The Josephson effect characterizes superfluids and superconductors separated by a weak link, the so-called Josephson junction. A recent experiment has shown that Josephson oscillations can be observed also in a supersolid, where the weak link is not due to an external barrier, but is self-induced by interparticle interactions. Here we show theoretically that supersolids -- despite their self-induced character -- feature all the standard properties of bosonic Josephson junction arrays, including macroscopic quantum self-trapping. We focus on the harmonically trapped dipolar supersolids of interest for current experiments, and show that they can be described with a generalized Josephson model that takes into account spatial inhomogeneities. Our work shades new light on the dynamics of supersolids and opens the way to the study of a novel class of Josephson junctions.

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