Quasiparticle properties in effective field theory Original Research Article

The quasiparticle concept is an important tool for the description of many-body systems. We study the quasiparticle properties for dilute Fermi systems with short-ranged, repulsive interactions using effective field theory. We calculate the proper self-energy contributions at order (kF/Λ)3, where Λ is the short-distance scale that sets the size of the effective range parameters and kF the Fermi momentum. The quasiparticle energy, width, and effective mass to View the MathML source are derived from the calculated self-energy.