Quasiparticle properties in effective field theory
Artikel i vetenskaplig tidskrift, 2003

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 A 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 O((k(F)/Lambda)(3)) are derived from the calculated self-energy. (C) 2002 Elsevier Science B.V. All rights reserved.

large scattering length

gas

fermi systems

effective field theory

3-body recombination

energy

systems

quasiparticles

Författare

H. W. Hammer

U. G. Meissner

Nuclear Physics A

0375-9474 (ISSN)

Vol. 714 1-2 250-264

Ämneskategorier

Subatomär fysik

Atom- och molekylfysik och optik