Effective potential for the second virial coefficient at Feshbach resonance

Details Effective potential for the second virial coefficient at Feshbach resonance Effective potential for the second virial coefficient at Feshbach resonance

2005-08-11

arxiv.org/abs/cond-mat/0508290v1

Physics

Condensed Matter

Statistical Mechanics

7 pages, no figsures

Scientific paper

In a recent paper entitled "High temperature expansion applied to fermions near Feshbach resonance" (Phys. Rev. Lett. 92, 160404 (2004)), Ho and Muller have demonstrated a remarkable similarity between its high and low temperature properties at resonance. The quantum second virial coefficient plays a crucial role in their analysis, and has a universal value at resonance. In this paper, we explore the connection between the quantum and classical second virial coefficients, and show that near a Feshbach resonance, an exact mapping from the quantum to classical form is possible. This gives rise to a scale independent inverse square potential for the classical second virial coefficient. It is suggested that it may be tested by measuring the isothermal compressibility of the gas on the repulsive side of the resonance.

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