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ABSENCE OF BCS CONDENSATION OF ATOMS IN A REPULSIVE FERMI GAS OF ATOMS.
- Source :
-
Modern Physics Letters B . 1/10/2008, Vol. 22 Issue 1, p9-16. 8p. - Publication Year :
- 2008
-
Abstract
- Bose–Einstein condensation of molecules and BCS condensation of Cooper pairs of atoms in an ultra-cold Fermi gas of atoms with a repulsive two-body interaction are studied by using the path integral representation of the grand partition function. From the self-consistent equations obtained in the present work for the order parameters, we have found that BCS condensation of atoms cannot occur in such a Fermi gas of atoms and that the condensate observed experimentally is composed of condensed molecules or possibly of preformed Cooper pairs. To substantiate our conclusions from the self-consistent equations for the order parameters, the effective atom–atom interaction mediated through molecules has also been computed with the Foldy–Wouthuysen transformation and has been found to be repulsive, which implies a net repulsive two-body interaction between atoms and hence the absence of BCS condensation of atoms. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CONDENSATION
*ATOMS
*ELECTRON gas
*MOLECULES
*EQUATIONS
Subjects
Details
- Language :
- English
- ISSN :
- 02179849
- Volume :
- 22
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Modern Physics Letters B
- Publication Type :
- Academic Journal
- Accession number :
- 28147675
- Full Text :
- https://doi.org/10.1142/S0217984908014547