Journal
PHYSICAL REVIEW A
Volume 65, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.65.043613
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In this paper we calculate the energy levels of two trapped atoms interacting through a spherical two-body potential V(r) under external confinement quantum mechanically. We then replace V(r) by either a regularized energy-independent or an energy-dependent delta-function potential. A comparison shows that the use of an energy-dependent pseudopotential improves significantly upon the use of an energy-independent pseudopotential. The accuracy of the pseudopotential approximation is approximately determined by the ratio beta(6)/a(ho), where beta(6) and a(ho) denote the characteristic length scale of the two-body interaction potential V(r) and of the trapping potential, respectively.
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