306 citations · 2.1k across the 48 of their papers we have counts for
15 papers · 1 filter
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…
Flat band transport and Josephson effect through a finite-size sawtooth lattice
Ville A. J. Pyykkönen, Sebastiano Peotta, Philipp Fabritius +3
We study theoretically the transport through a finite-size sawtooth lattice coupled to two fermionic reservoirs kept in the superfluid state. We focus on the DC Josephson effect an…
Flat band induced non-Fermi liquid behavior of multicomponent fermions
Pramod Kumar, Sebastiano Peotta, Yosuke Takasu +2
We investigate multicomponent fermions in a flat band and predict experimental signatures of non-Fermi liquid behavior. We use dynamical mean-field theory to obtain the density, do…
Sub-picosecond thermalization dynamics in condensation of strongly coupled lattice plasmons
Aaro I. Väkeväinen, Antti J. Moilanen, Marek Nečada +3
Bosonic condensates offer exciting prospects for studies of non-equilibrium quantum dynamics. Understanding the dynamics is particularly challenging in the sub-picosecond timescale…
Quantum corrections to a spin-orbit coupled Bose-Einstein Condensate
Long Liang, Päivi Törmä
We study systematically the quantum corrections to a weakly interacting Bose-Einstein condensate with spin-orbit coupling. We show that quantum fluctuations, enhanced by the spin-o…
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…
The Fulde-Ferrell-Larkin-Ovchinnikov state for ultracold fermions in lattice and harmonic potentials: a review
Jami J. Kinnunen, Jildou E. Baarsma, Jani-Petri Martikainen +1
We review the concepts and the present state of theoretical studies of spin-imbalanced superfluidity, in particular the elusive Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, in th…
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…
Fermi surface deformations and pairing in mixtures of dipolar and non-dipolar fermions
J. E. Baarsma, P. Törmä
We study mass-imbalanced two-component Fermi mixtures, where one of the components consists of dipolar fermions. We specifically study the mass imbalances corresponding to the atom…
Spin-asymmetric Josephson plasma oscillations
J. M. Kreula, G. Valtolina, P. Törmä
The spin-asymmetric Josephson effect is a proposed quantum-coherent tunnelling phenomenon where Cooper-paired fermionic spin- particles, which are subjected to spin-de…
Decoherence of an impurity in a one-dimensional fermionic bath with mass imbalance
A. -M. Visuri, J. J. Kinnunen, J. E. Baarsma +1
We study the transport, decoherence and dissipation of an impurity interacting with a bath of free fermions in a one-dimensional lattice. Numerical simulations are made with the ti…
Population imbalance in the extended Fermi-Hubbard model
A. Dhar, J. J. Kinnunen, P. Törmä
We study the interplay between population imbalance in a two-component fermionic system and nearest-neighbor interaction using matrix product states method. Our analysis reveals th…
Topological transitions of gapless paired states in mixed-geometry lattices
Dong-Hee Kim, Joel S. J. Lehikoinen, Päivi Törmä
We propose a mixed-geometry system of fermionic species selectively confined in lattices of different geometry. We investigate how such asymmetry can lead to exotic multiband fermi…
Bakhtiari, Leskinen and Torma Reply
M. Reza Bakhtiari, M. J. Leskinen, P. Törmä
This is a Reply to: Comment on "Spectral Signatures of the Fulde-Ferrell-Larkin-Ovchinnikov Order Parameter in One-Dimensional Optical Lattices" R. A. Molina J. Dukelksy, and P. Sc…
Induced interactions for ultracold Fermi gases in optical lattices
D. -H. Kim, P. Törmä, J. -P. Martikainen
We investigate the effect of optical lattices on the BCS superfluidity by using the Gorkov--Melik-Barkhudarov (GMB) correction for a two-component Fermi gas. We find that the suppr…