Dresden 2011 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 18: Ultra-cold atoms, ions and BEC II
Q 18.3: Talk
Tuesday, March 15, 2011, 11:00–11:15, BAR 106
Influence of reduced dimensionality on ultracold atoms — •Simon Sala1,2 and Alejandro Saenz1 — 1Institut 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)