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A functional renormalization group approach to the Anderson impurity model.
J Phys Condens Matter
July 2009
Institut für Theoretische Physik, Universität Frankfurt, Max-von-Laue Strasse 1, 60438 Frankfurt, Germany.
We develop a functional renormalization group approach which describes the low-energy single-particle properties of the Anderson impurity model up to intermediate on-site interactions [Formula: see text], where Δ is the hybridization in the wide-band limit. Our method is based on a generalization of a method proposed by Schütz et al (2005 Phys. Rev.
View Article and Find Full Text PDFAbsence of fermionic quasiparticles in the superfluid state of the attractive fermi gas.
Phys Rev Lett
February 2008
Institut für Theoretische Physik, Universität Frankfurt, Max-von-Laue Strasse 1, 60438 Frankfurt, Germany.
We calculate the effect of order parameter fluctuations on the fermionic single-particle excitations in the superfluid state of neutral fermions interacting with short-range attractive forces. We show that in dimensions D< or =3 the singular effective interaction between the fermions mediated by the gapless Bogoliubov-Anderson mode prohibits the existence of well-defined quasiparticles. We explicitly calculate the single-particle spectral function in the BEC regime in D=3 and show that in this case the quasiparticle residue and the density of states are logarithmically suppressed.
View Article and Find Full Text PDFBartosch and kopietz reply:
Phys Rev Lett
March 2000
Institut fur Theoretische Physik der Universitat Gottingen Bunsenstrasse 9, 37073 Gottingen, Germany.
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