Mainz 2026 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 43: Ultra-cold Atoms, Ions and BEC VI (joint session A/Q)
A 43.2: Vortrag
Freitag, 6. März 2026, 14:45–15:00, N 1
Hybridization of topological defects and repulsive polarons in a Bose gas — •Taha Alper Yogurt1, Matthew Eiles1, Nikolay Yegovtsev2, and Victor Gurarie2 — 1Max Planck Institute for the Physics of Complex Systems Nöthnitzer St. 38 01187 Dresden, Germany — 2Department of Physics and Center for Theory of Quantum Matter, University of Colorado, Boulder Colorado 80309, USA
The immersion of an impurity in a bosonic medium has enabled systematic exploration of the Bose polaron problem across the entire range of impurity-medium coupling strengths. Both attractive and repulsive polarons arising from inherently attractive impurity-medium interactions, such as those involving Rydberg or ionic impurities in neutral ultracold gases, have been extensively investigated. While the attractive polaron represents the ground state of the many-body impurity-bath system, the nature of the metastable repulsive polaron remains less understood. Here, we present a unified framework for describing both attractive and repulsive polarons in one- and two-dimensional (1D and 2D) Bose gases. By obtaining ground- and excited-state solutions of the Gross-Pitaevskii equation for a finite-range impurity potential in a weakly interacting Bose medium, we demonstrate that repulsive polarons are adiabatically connected to topological defects supported by the condensate. In 2D, these defects correspond to vortices and dark ring solitons, while they manifest as distinct solitonic configurations in 1D. Furthermore, we uncover a crossover between the repulsive and attractive polaron branches as the impurity-bath coupling strength increases.
Keywords: Bose Polaron; Soliton; Vortex; Repulsive polaron