Quasiparticle Properties in Effective Field Theory
Abstract
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/Lambda)3, where Lambda 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 order O(Kf/Lambda)3 are derived from the calculated self-energy.
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