Superfluid equation of state of dilute composite bosons

Details Superfluid equation of state of dilute composite bosons Superfluid equation of state of dilute composite bosons

2007-06-26

arxiv.org/abs/0706.3774v1

Phys. Rev. Lett. 99, 170402 (2007)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.99.170402

We present an exact theory of the BEC-BCS crossover in the BEC regime, which treats explicitely dimers as made of two fermions. We apply our framework, at zero temperature, to the calculation of the equation of state. We find that, when expanding the chemical potential in powers of the density n up to the Lee-Huang-Yang order, proportional to n^3/2, the result is identical to the one of elementary bosons in terms of the dimer-dimer scattering length a_M, the composite nature of the dimers appearing only in the next order term proportional to n^2 .

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