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Q: Quantenoptik und Photonik

Q 32: Poster Ultrakalte Moleküle

Q 32.2: Poster

Dienstag, 14. März 2006, 16:30–18:30, Labsaal

Understanding the Efimov-effect — •Bettina Berg, Lev Plimak, and Wolfgang P. Schleich — University Ulm, Germany

Bound states of three identical bosons interacting resonantly condense. That is, the low-lying levels form a geometrical progression converging to zero, E_N/E_N+1=e^{−2 π/|s₀|}, where s₀≈ i. This effect was discovered by V.N. Efimov in 1971. Although there exists an indication that Efimov states contribute to three-body losses in trapped ultracold atomic gases, until now these states have been eluding direct observation. We discuss certain aspects of the Efimov effect including the overall energy balance in the system of three interacting particles.

[1] V. N. Efimov: Weakly-Bound States of Three Resonantly-Interacting Particles, Sov. Jou. Nucl. Phys. 12, 589-595 (1971)

[2] V. N. Efimov: Effective interaction of three resonantly interacting particles and the force range, Phys. Rev. C 47, 1876-1884 (1993)

[3] D.V. Fedorov and A.S. Jensen: Efimov Effect in Coordinate Space Faddeev Equations, Phys. Rev. Lett. 71, 4103-4106 (1993)