paper

Tightly bound solitons and vortices in three-dimensional bosonic condensates with the electromagnetically-induced gravity

arXiv:2411.01554 · doi:10.1103/PhysRevE.111.064207

Abstract

The long-range interaction, induced by laser illumination, offers a mechanism for the implementation of stable self-trapping in Bose-Einstein condensates (BECs) in the three-dimensional free space. Using the variational approximation and numerical solutions, we find that self-trapped states in this setting , with attractive nonlocal and repulsive local interactions, resemble tightly-bound compactons. However, these are not true compactons but rather \textit{tightly self-trapped modes} (TSTMs), with small-amplitude nonvanishing tails. The structure of the self-trapped states is explained by an analytical solution for their tails. Further, we demonstrate that stable % TSTMs with embedded vorticity, exist in the same setting, with winding numbers up to (at least). Addressing two-TSTM interactions, we find that pairs of ground states (GSs, with ), as well as vortex-vortex and vortex-antivortex pairs (with and , respectively), form stably rotating bound states. Head-on collisions between vortex TSTMs, set in slow motion by kicks, are inelastic, resulting in their merger into a GS soliton, that may either remain at the collision position or move aside, shedding the angular momentum with emitted radiation, or, alternatively, lead to the formation of a vortex that also moves aside.

arXiv comment9 figure, 12 pages, and 119 references, published on Physical Review E 111, 064207 (2025)

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