Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Symposium “50 Years BCS Theory”

TT 16.1: Vortrag

Dienstag, 27. März 2007, 18:00–18:30, H20

BCS theory of a neutral Fermi liquid: the superfluid phases of Helium 3 — •Peter Woelfle — Institut f. Theorie der Kondensierten Materie, Universitaet Karlsruhe, 76128 Karlsruhe

The superfluid phases of Helium 3 are described in the framework of BCS theory with Cooper pairs of angular momentum L=1 and spin S=1. The necessary attractive interaction is mediated by intrinsic fluctuations of spin and mass current. The internal structure of the Cooper pairs allows for the existence of several different phases featuring a broad spectrum of excitations (nuclear spin resonance, zero sound, pair vibrations, vortices). Of particular interest is the existence of textures of the order parameter preferred directions, providing a background for unusual fermionic excitations. Analogies in the behavior of the superfluid A-phase with problems of current interest in elementary particle physics (chiral anomaly) and cosmology (Kibble-Zurek mechanism) may offer new insights to be gained from Helium laboratory experiments.