195 citations · 946 across the 16 of their papers we have counts for
7 papers · 1 filter
Ground state properties of interacting Bose polarons
Senne Van Loon, Wim Casteels, Jacques Tempere
We theoretically investigate the role of multiple impurity atoms on the ground state properties of Bose polarons. The Bogoliubov approximation is applied for the description of the…
Truncated correlation hierarchy schemes for driven-dissipative multimode quantum systems
Wim Casteels, Stefano Finazzi, Alexandre Le Boité +2
We present a method to describe driven-dissipative multi-mode systems by considering a truncated hierarchy of equations for the correlation functions. We consider two hierarchy tru…
Polaron formation in the vicinity of a narrow Feshbach resonance in atomic and exciton-polariton condensates
Wim Casteels, Michiel Wouters
The polaronic system consisting of an impurity in a dilute Bose-Einstein condensate is considered in the presence of a narrow Feshbach resonance. For this purpose a coupled-channel…
Diagrammatic Monte Carlo study of the acoustic and the BEC polaron
Jonas Vlietinck, Wim Casteels, Kris Van Houcke +3
We consider two large polaron systems that are described by a Fröhlich type of Hamiltonian, namely the Bose-Einstein condensate (BEC) polaron in the continuum and the acoustic pola…
Bipolarons and multi-polarons consisting of impurity atoms in a Bose-Einstein condensate
W. Casteels, J. Tempere, J. T. Devreese
The variational Feynman formalism for the polaron, extended to an all-coupling treatment of bipolarons, is applied for two impurity atoms in a Bose-Einstein condensate. This shows…
Polaronic properties of an impurity in a Bose-Einstein condensate in reduced dimensions
W. Casteels, J. Tempere, J. T. Devreese
The application of optical lattices allows a tuning of the geometry of Bose-Einstein condensates to effectively reduced dimensions. In the context of solid state physics the consid…
Response of the polaron system consisting of an impurity in a Bose-Einstein condensate to Bragg spectroscopy
W. Casteels, J. Tempere, J. T. Devreese
We expand the existing polaron response theory, expressed within the Mori-Zwanzig projection operator formalism applicable for the transfer of arbitrary energy and zero momentum, t…