340 citations · 924 across the 12 of their papers we have counts for
12 papers
Probing spatially resolved spin density correlations with trapped excitons
Shanshan Ding, Jose Antonio Valerrama Botia, Aleksi Julku +2
The rapidly growing class of atomically thin and tunable van der Waals materials is intensely investigated both in the context of fundamental science and for new technologies. Ther…
Exciton interacting with a moiré lattice: Polarons, strings, and optical probing of spin correlations
Aleksi Julku, Shanshan Ding, Georg M. Bruun
We develop a general theory for how an exciton in an atomically thin transition metal dichacogenide (TMD) monolayer couples to spin and charge correlations in an adjacent moire lat…
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…
Non-local interactions and supersolidity of moiré excitons
Aleksi Julku
Heterobilayer transition metal dichalcogenide (TMDC) moiré systems provide an ideal framework to investigate strongly correlated physics. Here we theoretically study bosonic many-b…
Light-induced topological superconductivity in transition metal dichalcogenide monolayers
Aleksi Julku, Jami J. Kinnunen, Arturo Camacho-Guardian +1
Monolayer transition metal dichalcogenides (TMDs) host deeply bound excitons interacting with itinerant electrons, and as such they represent an exciting new quantum many-body Bose…
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…
Nonlinear optical response of resonantly driven polaron-polaritons
Aleksi Julku, Miguel. A. Bastarrachea-Magnani, Arturo Camacho-Guardian +1
Exciton polaritons in two-dimensional semiconductors inside microcavities are powerful platforms to explore hybrid light-matter quantum systems. Here, we study a macroscopic cohere…
Superfluid weight and Berezinskii-Kosterlitz-Thouless transition temperature of twisted bilayer graphene
Aleksi Julku, Teemu J. Peltonen, Long Liang +2
We study superconductivity of twisted bilayer graphene with local and non-local attractive interactions. We obtain the superfluid weight and Berezinskii-Kosterlitz-Thouless (BKT) t…
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…