Diagrammatic Pairing Fluctuations Approach to the BCS-BEC Crossover

TL;DR

This paper surveys a diagrammatic approach to fermionic pairing fluctuations relevant to the BCS-BEC crossover in ultracold Fermi gases, emphasizing physical intuition and comparing results with other methods.

Contribution

It introduces and discusses a diagrammatic approach for pairing fluctuations, providing insights into the physical processes and comparing with alternative methods.

Findings

Thermodynamic quantities analyzed

Dynamical quantities analyzed

Comparison with alternative approaches

Abstract

This paper gives a survey of a diagrammatic approach for fermionic pairing fluctuations, which are relevant to the BCS-BEC crossover realized with ultracold Fermi gases. Emphasis will be given to the physical intuition about the relevant physical processes that can be associated with this approach. Specific results will be presented for thermodynamic and dynamical quantities, where a critical comparison with alternative diagrammatic approaches will also be attempted.