Fig. 1: Sketch of the system and the ground state energy.
From: Emergence of a Bose polaron in a small ring threaded by the Aharonov-Bohm flux
a Sketch of the system. The bosons are shown as blue balls at the positions xi; the impurity is a red ball at y. The AB flux is Φ. The strength of the boson-boson (boson-impurity) interaction is given by g (c). b Sketch of the ground-state energy as a function of the flux without (c = 0) and with (c > 0) the interaction with the bosonic environment (leading to an energy shift Ep at Φ = 0). The total momentum of the system is P/L. The shift of the energy spectrum, Ep, and the change of the curvature can be parameterized by effective one-body parameters, see the text for details.
