Superfluid equation of state of cold fermionic gases in the Bose-Einstein regime

Details Superfluid equation of state of cold fermionic gases in the Bose-Einstein regime Superfluid equation of state of cold fermionic gases in the Bose-Einstein regime

2008-07-10

arxiv.org/abs/0807.1622v1

Phys. Rev. A 78, 053621 (2008)

Physics

Condensed Matter

Statistical Mechanics

25 pages, 11 figures

Scientific paper

10.1103/PhysRevA.78.053621

We present an exact many-body theory of ultracold fermionic gases for the Bose-Einstein condensation (BEC) regime of the BEC-BCS crossover. This is a purely fermionic approach which treats explicitely and systematically the dimers formed in the BEC regime as made of two fermions. We consider specifically the zero temperature case and calculate the first terms of the expansion of the chemical potential in powers of the density $n$. We derive first the mean-field contribution, which has the expected standard expression when it is written in terms of the dimer-dimer scattering length $a_M$. We go next in the expansion to the Lee-Huang-Yang order, proportional to $n^{3/2}$. We find the far less obvious result that it retains also the same expression in terms of $a_M$ as for elementary bosons. The composite nature of the dimers appears only in the next term proportional to $n^2$.

Affiliated with

Also associated with

No associations

Rating

Superfluid equation of state of cold fermionic gases in the Bose-Einstein regime does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Superfluid equation of state of cold fermionic gases in the Bose-Einstein regime, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Superfluid equation of state of cold fermionic gases in the Bose-Einstein regime will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-459566