306 citations · 2.1k across the 48 of their papers we have counts for
4 papers · 1 filter
Magnetization, d-wave superconductivity and non-Fermi liquid behavior in a crossover from dispersive to flat bands
Pramod Kumar, Tuomas I. Vanhala, Päivi Törmä
We explore the effect of inhomogeneity on electronic properties of the two-dimensional Hubbard model on a square lattice using dynamical mean-field theory (DMFT). The inhomogeneity…
Effective theory and emergent symmetry in the flat bands of attractive Hubbard models
Murad Tovmasyan, Sebastiano Peotta, Päivi Törmä +1
In a partially filled flat Bloch band electrons do not have a well defined Fermi surface and hence the low-energy theory is not a Fermi liquid. Neverethless, under the influence of…
Beyond linear response spectroscopy of ultracold Fermi gases
J. Kinnunen, P. Torma
We study RF-spectroscopy of ultracold Fermi gas by going beyond the linear response in the field-matter interaction. Higher order perturbation theory allows virtual processes and e…
Signatures of superfluidity for Feshbach-resonant Fermi gases
J. Kinnunen, M. Rodriguez, P. Torma
We consider atomic Fermi gases where Feshbach resonances can be used to continuously tune the system from weak to strong interaction regime, allowing to scan the whole BCS-BEC cros…