Density and spin response functions in ultracold fermionic atom gases

Details Density and spin response functions in ultracold fermionic atom gases Density and spin response functions in ultracold fermionic atom gases

2005-02-03

arxiv.org/abs/cond-mat/0502110v1

Phys.Rev.Lett. 95 (2005) 090402

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevLett.95.090402

We propose a new method of detecting the onset of superfluidity in a two-component ultracold fermionic gas of atoms governed by an attractive short-range interaction. By studying the two-body correlation functions we find that a measurement of the momentum distribution of the density and spin response functions allows one to access separately the normal and anomalous densities. The change in sign at low momentum transfer of the density response function signals the transition between a BEC and a BCS regimes, characterized by small and large pairs, respectively. This change in sign of the density response function represents an unambiguous signature of the BEC to BCS crossover. Also, we predict spin rotational symmetry-breaking in this system.

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