Low Temperature Physics: 35, 610 (2009); https://doi.org/10.1063/1.3224735 (9 pages)
Физика Низких Температур: Том 35, Выпуск 8-9 (Август 2009), c. 779-788    ( к оглавлению , назад )

BCS-BEC crossover and nodal points contribution in p-wave resonance superfluids

M.Yu. Kagan1 and D.V. Efremov1,2

1 P.L. Kapitza Institute for Physical Problems, 2 Kosygina Str., Moscow 119334, Russia
E-mail: kagan@kapitza.ras.ru

2 Institute for Theoretical Physics, Technical University of Dresden, Dresden, Germany

Received December 22, 2008

Аннотация

We solve the Leggett equations for BCS–BEC crossover of the resonance p-wave superfluid. We calculate sound velocity, specific heat and the normal density for the BCS-domain (μ > 0), BEC-domain (μ < 0) as well as for the interesting interpolation point (μ = 0) in the triplet A1-phase in 3D. We are especially interested in the quasiparticle contribution coming from the zeroes of the superfluid gap in the A1-phase. We discuss the spectrum of orbital waves and the superfluid hydrodynamics at temperature T → 0. In this context we elucidate the difficult problem of chiral anomaly and mass-current nonconcervation appearing in the BCS-domain. We present the different approaches to solve this problem. To clarify this problem experimentally we propose an experiment for the measurement of anomalous current in superfluid A1-phase in the presence of aerogel for 3He and in the presence of Josephson tunneling structures for the ultracold gases in magnetic traps.

PACS: 67.30.H– Superfluid phase of 3He;
PACS: 67.85.Lm Degenerate Fermi gases;
PACS: 74.20.Rp Pairing symmetries (other than s-wave).

Ключевые слова: BCS–BEC crossover, Feshbach resonance, superfluidity, 3He-A, chiral anomaly.