Superfluidity and excitations at unitarity

Details Superfluidity and excitations at unitarity Superfluidity and excitations at unitarity

2006-06-28

arxiv.org/abs/cond-mat/0606706v2

Phys.Rev.B75:134502,2007

Physics

Condensed Matter

Statistical Mechanics

40 pages, 19 figures, revised version includes new data on two-particle density correlations

Scientific paper

10.1103/PhysRevB.75.134502

We present lattice results for spin-1/2 fermions at unitarity, where the effective range of the interaction is zero and the scattering length is infinite. We measure the spatial coherence of difermion pairs for a system of 6, 10, 14, 18, 22, 26 particles with equal numbers of up and down spins in a periodic cube. Using Euclidean time projection, we analyze ground state properties and transient behavior due to low-energy excitations. At asymptotically large values of t we see long-range order consistent with spontaneously broken U(1) fermion-number symmetry and a superfluid ground state. At intermediate times we see exponential decay in the t-dependent signal due to an unknown low-energy excitation. We probe this low-energy excitation further by calculating two-particle correlation functions. We find that the excitation has the properties of a chain of particles extending across the periodic lattice.

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