267 citations · 1.1k across the 34 of their papers we have counts for
15 papers · 1 filter
Many-body bound states and induced interactions of charged impurities in a bosonic bath
G. E. Astrakharchik, L. A. Peña Ardila, K. Jachymski +1
Induced interactions and bound states of charge carriers immersed in a quantum medium are crucial for the investigation of quantum transport. Ultracold atom-ion systems can provide…
Collisional losses of ultracold molecules due to intermediate complex formation
Krzysztof Jachymski, Marcin Gronowski, Michał Tomza
Understanding the sources of losses and chemical reactions of ultracold alkali-metal molecules is among the critical elements needed for their application in precision measurements…
Inelastic collision dynamics of a single cold ion immersed in a Bose-Einstein condensate
Thomas Dieterle, Moritz Berngruber, Christian Hölzl +4
We investigate inelastic collision dynamics of a single cold ion in a Bose-Einstein condensate. We observe rapid ion-atom-atom three-body recombination leading to formation of weak…
Ionic polaron in a Bose-Einstein condensate
G. E. Astrakharchik, L. A. Peña Ardila, R. Schmidt +2
The presence of strong interactions in a many-body quantum system can lead to a variety of exotic effects. Here we show that even in a comparatively simple setup consisting of a ch…
Quantum simulation of extended polaron models using compound atom-ion systems
Krzysztof Jachymski, Antonio Negretti
We consider the prospects for quantum simulation of condensed matter models exhibiting strong electron-phonon coupling using a hybrid platform of trapped laser-cooled ions interact…
Quantum droplets in a dipolar Bose gas at a dimensional crossover
Pawel Zin, Maciej Pylak, Tomasz Wasak +2
We study the beyond-mean-field corrections to the energy of a dipolar Bose gas confined to two dimensions by a box potential with dipoles oriented in plane. At a critical strength…
Beyond-mean-field corrections for dipolar bosons in an optical lattice
Jan Kumlin, Krzysztof Jachymski, Hans Peter Büchler
Recent experiments with ultracold lanthanide atoms which are characterized by a large magnetic moment have revealed the crucial importance of beyond-mean-field corrections in under…
Nonuniversal beyond mean field properties of quasi-two-dimensional dipolar Bose gases
Krzysztof Jachymski, Rafał Ołdziejewski
We study a quasi-two dimensional gas of bosonic dipoles, calculating the beyond mean field corrections to the ground state energy and chemical potential neglecting the transverse m…
Ultracold atoms in quasi-1D traps: a step beyond the Lieb-Liniger model
Krzysztof Jachymski, Florian Meinert, Hagar Veksler +2
Ultracold atoms placed in a tight cigar-shaped trap are usually described in terms of the Lieb-Liniger model. We study the extensions of this model which arise when van der Waals i…
Properties of strongly dipolar Bose gases beyond the Born approximation
Rafał Ołdziejewski, Krzysztof Jachymski
Strongly dipolar Bose gases can form liquid droplets stabilized by quantum fluctuations. In theoretical description of this phenomenon, low energy scattering amplitude is utilized…
Inelastic collisions of ultracold triplet Rb molecules in the rovibrational ground state
Björn Drews, Markus Deiß, Krzysztof Jachymski +2
Exploring inelastic and reactive collisions on the quantum level is a main goal of the developing field of ultracold chemistry. We present first experimental studies of inelastic c…
Broad universal Feshbach resonances in the chaotic spectrum of Dysprosium atoms
Thomas Maier, Igor Ferrier-Barbut, Holger Kadau +6
We report on the observation of weakly-bound dimers of bosonic Dysprosium with a strong universal s-wave halo character, associated with broad magnetic Feshbach resonances. These s…
Reactive collisions in confined geometries
Zbigniew Idziaszek, Krzysztof Jachymski, Paul S. Julienne
We consider low energy threshold reactive collisions of particles interacting via a van der Waals potential at long range in the presence of external confinement and give analytic…
Feshbach resonances in a nonseparable trap
Krzysztof Jachymski, Zbigniew Idziaszek, Tommaso Calarco
We consider a pair of atoms in an arbitrary trapping potential in the presence of magnetically tunable Feshbach resonance. We find the energy levels and occupation of the bound mol…
Light scattering from ultracold gases in disordered optical lattices
Krzysztof Jachymski, Zbigniew Idziaszek
We consider a gas of bosons in a bichromatic optical lattice at finite temperatures. As the amplitude of the secondary lattice grows, the single-particles eigenstates become locali…