Mesoscopic Systems Group

1. prof. dr hab. Mirosław Brewczyk - head
2. dr hab. Tomasz Karpiuk, prof. UwB
3. dr Krzysztof Gawryluk

Phd:

1. mgr Maciej Lewkowicz

The research group focuses on theoretical and computational studies of ultracold degenerate atomic gases, with particular emphasis on weakly interacting bosonic systems at finite temperatures. Its activities encompass spinor and dipolar Bose-Einstein condensates (including the investigation of dipolar resonances), dynamical properties of cold atomic gases and mixtures, and the emergence of novel quantum phases such as supersolidity. A significant part of the research addresses topological properties of atomic gases and the role of correlations in low-dimensional bosonic and fermionic systems. In addition, the group develops and employs quantum simulation approaches to model complex many-body and astrophysical phenomena, including the stripping and tidal disruption of a white dwarf star in the gravitational field of a black hole.

• Ultracold degenerate atomic gases
• Weakly interacting bosons at nonzero temperatures
• Spinor and dipolar condesates; dipolar resonances; dynamic properties of cold gases and mixtures; topological properties of atomic gases; supersolid phase
• Correlations in low-dimensional bosonic and fermionic gases
• Bose-Fermi droplets
• Quantum simulators (stripping and disruption of a white dwarf star in the field of a black hole)

• Institute of Physics, Polish Academy of Sciences, Warsaw
• Center for Theoretical Physics, Polish Academy of Sciences, Warsaw
• Institute of Information Technology, Warsaw University of Life Sciences, Warsaw
• Centre for Quantum Technologies, National University of Singapore, Singapore
• Laboratoire de Physique des Lasers, Universite Paris 13

2025

• Supersolidity of dipolar Bose-Einstein condensates induced by coupling to fermions, Phys. Rev. A 111, L011301 (2025)
• Studying the radiation of a white dwarf star falling onto a black hole, The Astrophysical Journal, Volume 980, Issue 2, id.256, 9 pp. (2025)

2024

• Fermionic atoms in a spin-dependent optical lattice potential: topological insulators with broken time-reversal symmetry, Phys. Rev. B 110, 205430 (2024)
• Mechanism for sound dissipation in a two-dimensional degenerate Fermi gas, Scientific Reports 14, 10815 (2024)

2023

• Phase separation of a repulsive two-component Fermi gas at the two- to three-dimensional crossover, Phys. Rev. A 110, 023325 (2024)

2022

• Dynamics of large samples of repulsive Fermi gases at nonzero temperatures, Physical Review A 105, 023315 (2022)
• Atoms in a spin dependent optical potential: ground state topology and magnetization, New J. Phys. 24 033041 (2022)

2021

• Spin distillation cooling of ultracold Bose gases, Scientific Reports 11, 6441 (2021)
• Berezinskii-Kosterlitz-Thouless phase induced by dissipating quasisolitons, Sci Rep 11, 10773 (2021)
• Modelling quantum aspects of disruption of a white dwarf star by a black hole, Scientific Reports, (2021) 11:2286
• Phase Transitions of Repulsive Two-Component Fermi Gases in Two Dimensions, New J. Phys. 23, 103042 (2021)

2020

• Bistability of Bose-Fermi mixtures, New J Phys. 22, 103025 (2020)
• Breathing Mode of a Bose-Einstein Condensate Immersed in a Fermi Sea, Phys. Rev. Lett. 125, 103401 (2020)
• Nonzero temperature dynamics of a repulsive two-component Fermi gas, Phys. Rev. A 101, 013618 (2020)
• Collective oscillations of a two-component Fermi gas on the repulsive branch, SciPost Phys. 8, 066 (2020)
• Fermionic quantum carpets: From canals and ridges to solitonlike structures, Phys. Rev. Research 2, 013119 (2020)

2019

• Signatures of a universal jump in the superfluid density in two-dimensional Bose gas with finite number of particles, Phys. Rev. A 99, 033615 (2019)
• Self-bound Bose-Fermi liquids in lower dimensions, New J. Phys. 21, 073027 (2019)
• Quantum Bose-Fermi droplets, SciPost Phys. 6, 079 (2019)

2017

• Unified description of dynamics of a repulsive two-component Fermi gas, Phys. Rev. Lett. 119, 215303 (2017)
• Condensate losses and oscillations induced by Rydberg atoms, J. Phys. B: At. Mol. Opt. Phys. 50 (2017) 055003
• Thermal solitons as revealed by static structure factor, Phys. Rev. A 95, 043612 (2017)

2016

• Competition between Bose Einstein Condensation and spin dynamics Phys. Rev. Lett. 117, 185302 (2016)
• Single-shot simulations of dynamics of quantum dark solitons Phys. Rev. A 94, 023623 (2016)
• Ground-state densities of repulsive two-component Fermi gases Phys. Rev. A 93, 023612 (2016)

2015

• Density fluctuations in a quasi-one-dimensional Bose gas as observed in free expansion Phys. Rev. A 92, 043607 (2015)
• Imaging single Rydberg electrons in a Bose-Einstein condensate New J. Phys. 17, 053046 (2015)
• Correspondence between dark solitons and the type II excitations of Lieb-Liniger model Phys. Rev. A 91, 013621 (2015)
• Thermalization of matter waves in speckle potentials Phys. Rev. A 92, 063614 (2015)

2014

• Mott-insulator phases at half-integer fillings in the imbalanced honeycomb lattice Phys. Rev. A 89, 063615 (2014)
• Optimization as a route towards observing the Einstein-de Haas effect in a rubidium condensate Phys. Rev. A 90, 063635 (2014)
• Resonant dynamics of chromium condensates Phys. Rev. A 89, 023622 (2014)