P. Pieri

Observation of pseudogap behaviour in a strongly interacting Fermi gas

An ultracold gas of strongly interacting fermions exhibits a pseudogap phase in which pairs of fermions exist above the superfluid transition, but lack the phase coherence of a superfluid.

BCS-BEC Crossover at Finite Temperature for Superfluid Trapped Fermi Atoms

We consider the BCS-BEC (Bose-Einstein-condensate) crossover for a system of trapped Fermi atoms at finite temperature, both below and above the superfluid critical temperature, by including fluctuations beyond mean field. We determine the superfluid critical temperature and the pair-breaking temperature as functions of the attractive interaction between Fermi atoms, from the weak- to the strong-coupling limit (where bosonic molecules form as bound-fermion pairs). Density profiles in the trap are also obtained for all temperatures and couplings.

Pseudogap and spectral function from superconducting fluctuations to the bosonic limit

The crossover from weak to strong coupling for a three-dimensional continuum model of fermions interacting via an attractive contact potential is studied above the superconducting critical temperature

Quantitative comparison between theoretical predictions and experimental results for the BCS-BEC crossover

{T}_{c}.

Colour confinement as dual Meissner effect:

The pair-fluctuation propagator, the one-loop self-energy, and the spectral function are investigated in a systematic way from the superconducting fluctuation regime (weak coupling) to the bosonic regime (strong coupling). Analytic and numerical results are reported. In the strong-coupling regime, where the pair fluctuation propagator has bosonic character, two quite different peaks appear in the spectral function at a given wave vector, a broad one at negative frequencies and a narrow one at positive frequencies. The broad peak is asymmetric about its maximum, with its spectral weight decreasing by increasing coupling and temperature. In this regime, two crossover temperatures

SU(2)

{T}_{1}^{*}

gauge theory

(at which the two peaks in the spectral function merge in one peak) and

Derivation of the Gross-Pitaevskii equation for condensed bosons from the Bogoliubov-de Gennes equations for superfluid fermions

{T}_{0}^{*}

Evolution of the Normal State of a Strongly Interacting Fermi Gas from a Pseudogap Phase to a Molecular Bose Gas

(at which the maximum of the lower peak crosses zero frequency) can be identified, with

Trapped Fermions with Density Imbalance in the Bose-Einstein Condensate Limit

{T}_{c}\ensuremath{\ll}{T}_{0}^{*}l{T}_{1}^{*}.