340 citations · 924 across the 12 of their papers we have counts for
6 papers · 1 filter
Polarons and bipolarons in a two-dimensional square lattice
Shanshan Ding, G. A. Domínguez-Castro, Aleksi Julku +2
Quasiparticles and their interactions are a key part of our understanding of quantum many-body systems. Quantum simulation experiments with cold atoms have in recent years advanced…
Supefluidity of flat band Bose-Einstein condensates revisited
Aleksi Julku, Grazia Salerno, Päivi Törmä
We consider the superfluid weight, speed of sound and excitation fraction of a flat band Bose-Einstein condensate (BEC) within multiband Bogoliubov theory. The superfluid weight is…
Quantum geometry and flat band Bose-Einstein condensation
Aleksi Julku, Georg M. Bruun, Päivi Törmä
We study the properties of a weakly interacting Bose-Einstein condensate (BEC) in a flat band lattice system by using multiband Bogoliubov theory, and discover fundamental connecti…
Superfluid weight and Berezinskii-Kosterlitz-Thouless temperature of spin-imbalanced and spin-orbit-coupled Fulde-Ferrell phases in lattice systems
Aleksi Julku, Long Liang, Päivi Törmä
We study the superfluid weight and Berezinskii-Kosterlitz-Thouless (BKT) transition temperatures in case of exotic Fulde-Ferrell (FF) superfluid states in lattice s…
Bose-Einstein Condensation in a Plasmonic Lattice
Tommi K. Hakala, Antti J. Moilanen, Aaro I. Väkeväinen +6
Bose-Einstein condensation is a remarkable manifestation of quantum statistics and macroscopic quantum coherence. Superconductivity and superfluidity have their origin in Bose-Eins…
Geometric origin of superfluidity in the Lieb lattice flat band
Aleksi Julku, Sebastiano Peotta, Tuomas Vanhala +2
The ground state and transport properties of the Lieb lattice flat band in the presence of an attractive Hubbard interaction are considered. It is shown that the superfluid weight…