Two-body correlations and the superfluid fraction for nonuniform systems

Details Two-body correlations and the superfluid fraction for nonuniform systems Two-body correlations and the superfluid fraction for nonuniform systems

2006-12-18

arxiv.org/abs/cond-mat/0612464v1

Physics

Condensed Matter

Statistical Mechanics

13 pages

Scientific paper

10.1007/s10909-007-9501-z

We extend the one-body phase function upper bound on the superfluid fraction in a periodic solid (a spatially ordered supersolid) to include two-body phase correlations. The one-body current density is no longer proportional to the gradient of the one-body phase times the one-body density, but rather it depends also on two-body correlation functions. The equations that simultaneously determine the one-body and two-body phase functions require a knowledge of one-, two-, and three-body correlation functions. The approach can also be extended to disordered solids. Fluids, with two-body densities and two-body phase functions that are translationally invariant, cannot take advantage of this additional degree of freedom to lower their energy.

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