Virial theorems for trapped cold atoms

Details Virial theorems for trapped cold atoms Virial theorems for trapped cold atoms

2008-03-22

arxiv.org/abs/0803.3277v3

Physical Review A: Atomic, Molecular and Optical Physics 78 (2008) 025601

Physics

Condensed Matter

Other Condensed Matter

A few small corrections

Scientific paper

10.1103/PhysRevA.78.025601

We present a general virial theorem for quantum particles with arbitrary zero-range or finite-range interactions in an arbitrary external potential. We deduce virial theorems for several situations relevant to trapped cold atoms: zero-range interactions with and without Efimov effect, hard spheres, narrow Feshbach resonances, and finite-range interactions. If the scattering length $a$ is varied adiabatically in the BEC-BCS crossover, we find that the trapping potential energy as a function of $1/a$ has an inflexion point at unitarity.

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