Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 10: Ultra-cold atoms, ions and BEC II (with Q)

A 10.3: Vortrag

Dienstag, 15. März 2011, 11:00–11:15, BAR 106

Influence of reduced dimensionality on ultracold atoms — •Simon Sala1,2 and Alejandro Saenz11Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin — 2Kirchhoff-Institut für Physik, Ruprecht-Karls Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg

Low-dimensional systems of ultracold atoms show unique quantum signatures which are not present in the three dimensional case. Two topical examples in the quasi 1D regime are the fermionization of Bosons, i.e. strongly repulsive Bosons acquire fermionic properties, and the appearance of a confinement-induced resonance (CIR)[1]. Recently both effects were experimentally observed [2,3]. Quasi one-dimensional systems are realized by a tight confinement in two spatial directions freezing out two degrees of freedom. We present a theoretical treatment of two atoms in quasi one-dimensional traps using a full six-dimensional exact diagonalization technique [4]. Coupling effects due to anharmonicity of the trapping potential and the resulting effects on a CIR are investigated. Especially the experimental observed [3] splitting of CIR positions in completely anisotropic traps is an open question we try to answer.
[1] M. Olshanii, Phys. Rev. Lett. 81, 938 (1998)
[2] B. Paredes et al., Nature 429, 277 (2004)
[3] Haller et al., Phys. Rev. Lett. 104, 153202 (2010)
[4] S. Grishkevich, A. Saenz, Phys. Rev. A 80, 013403 (2009)

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