This report addresses topics and questions of common interest in the fields of ultra-cold
gases and nuclear physics in the context of the BCS–BEC crossover. By this crossover, the …

The physics of quantum degenerate atomic Fermi gases in uniform as well as in
harmonically trapped configurations is reviewed from a theoretical perspective. Emphasis is …

Ultracold atomic gases are a powerful tool to experimentally study strongly correlated
quantum many-body systems. In particular, ultracold Fermi gases with tunable interactions …

We perform a detailed study of the collective mode across the whole crossover from the
Bose-Einstein condensate (BEC)-to the BCS regime in fermionic gases at zero temperature …

Spontaneous symmetry breaking is a central paradigm of elementary particle physics,
magnetism, superfluidity and superconductivity. According to Goldstone's theorem, phase …

Higgs and Goldstone modes are possible collective modes of an order parameter on
spontaneously breaking a continuous symmetry. Whereas the low-energy Goldstone …

We present a calculation of the spectral functions and the associated rf response of ultracold
fermionic atoms near a Feshbach resonance. The single-particle spectra are peaked at …

We present a theoretical study of the ground state of the BCS-BEC crossover in dilute two-
dimensional Fermi gases. While the mean-field theory provides a simple and analytical …

We calculate the critical temperature below which an excitonic insulator exists at the
pressure-induced semiconductor-semimetal transition. Our approach is based on an …

We investigate strong-coupling effects on normal-state properties of an ultracold Fermi gas.
Within the framework of T-matrix approximation in terms of pairing fluctuations, we calculate …