M. S. would like to thank the Institut Henri Poincaré (UAR 839 CNRS-Sorbonne Université) and the LabEx CARMIN (ANR-10-LABX-59-01) for their support and hospitality during the final stages of completion of this work. M.S. acknowledges the National Science Centre, Poland, within Sonata Bis Grant No. 2020/38/E/ST2/00564. M.S. acknowledges the National Science Centre, Poland, within Preludium Grant No. 2023/49/N/ST2/03820. M.S. gratefully acknowledges Poland's high-performance Infrastructure PLGrid ACK Cyfronet AGH for providing computer facilities and support within computational grant no PLG/2023/016878.

This repository accompanies research paper investigating the physics of quantum rotor in a two-dimensional mesoscopic Bose gas: M. Suchorowski, A. Badamshina, M. Lemeshko, M. Tomza, A. G. Volosniev, 2024. Quantum rotor in a two-dimensional mesoscopic Bose gas ( arXiv:2407.06046) The contained code allows to reproduce results and figures from the paper, namely: ground-state energy, rotational energy, angular momenta of the system as function of interaction strengths, number of bosons, harmonic constant. Code was written by Michał Suchorowski (University of Warsaw).