BCS and BEC p-wave pairing in Bose-Fermi gases |
| |
Authors: | F Matera A Dellafiore |
| |
Institution: | (2) Institut für Theoretische Physik, Universität Innsbruck, Technikerstr. 25, Innsbruck, 6020, Austria |
| |
Abstract: | The pairing of fermionic atoms in a mixture of atomic fermion and boson gases at zero
temperature is investigated. The attractive interaction between fermions, that can be
induced by density fluctuations of the bosonic background, can give rise to a superfluid
phase in the Fermi component of the mixture. The atoms of both species are assumed to be
in only one internal state, so that the pairing of fermions is effective only in
odd-l channels. No assumption about the value of the ratio between the
Fermi velocity and the sound velocity in the Bose gas is made in the derivation of the
energy gap equation. The gap equation is solved without any particular ansatz
for the pairing field or the effective interaction. The p-wave
superfluidity is studied in detail. By increasing the strength and/or decreasing the range
of the effective interaction a transition of the fermion pairing regime, from the
Bardeen-Cooper-Schrieffer state to a system of tightly bound couples can be realized.
These composite bosons behave as a weakly-interacting Bose-Einstein condensate. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|