Osnabrück 2002 – wissenschaftliches Programm

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A: Atomphysik

A 9: Poster I

A 9.9: Poster

Mittwoch, 6. März 2002, 11:00–13:00, Schloss

Finite Temperature Effects on Atomic Scattering from BEC — •Ivo Häring and Jan-Michael Rost — Max-Planck-Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, 01187 Dresden

With the help of a mean field factorization scheme it is possible to diagonalize the grand-canonical hamiltonian of the bosons in a trap keeping approximations for the third and forth order products of the linear deviation operator δΨ from the lowest mode. Approximate schemes to the obtained self-consistent Hartree-Fock-Bogoliubov equations allow the description of condensded and non-condensed fraction at zero and finite temperature below the critical temperature for condensation [1].

If the single probe atoms have low energy the scattering potential is proportional to the number operator of all particles. Thus one probes both, the order parameter Ψ₀ and the noncondensed density. We use the first Born approximation for the differential and total cross sections [2] and spherically symmetric effective potentials dressed by a rf-field [3]. The potentials are finite and permit asymptotic free states [4].

[1] A. Griffin Phys. Rev. B 53 9341 (1996), [2] P. Öhberg et al. Phys. Rev. A 56 3346 (1997), [3] W. Ketterle and N.J. van Druten Adv. At. Mol. opt. Phys. 37 181 (1996), [4] A. Wynveen et al. Phys. Rev. A 62 023602 (2000)