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 (K_f/Lambda)^3, where Lambda is the short-distance scale that sets the size of the effective range parameters and K_f the Fermi momentum. The quasiparticle energy, width, and effective mass to order O(K_f/Lambda)^3 are derived from the calculated self-energy.

15 pages, revtex4, 4 PS figures

References in corpus (3)

• Effective Field Theory for Few-Nucleon Systems
• The Dilute Bose-Einstein Condensate with Large Scattering Length
• Are Occupation Numbers Observable?

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