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Q: Quantenoptik und Photonik

Q 75: Kurzvorträge zum Symposium Mesoskopische Physik ultrakalter Atome (SYUA)

Q 75.4: Talk

Wednesday, March 9, 2005, 16:45–17:00, HU Audimax

Interacting ultracold atoms with disorder confined to one dimension — •M. Thorwart¹, V. Peano¹, C. Mora¹, A. De Martino¹, R. Egger¹, and R. Graham² — ¹Universität Düsseldorf — ²Universität Duisburg-Essen

We investigate ultracold atom gases with strong interaction which are confined to one dimension. First, a novel nanoscale waveguide is proposed which is based on doubly-clamped suspended multiwall carbon nanotubes. A non-parabolic trapping potential for weak-field seeking atoms is formed. Various estimates on time scales for possible sources of imperfection show that decoherence for this setup is weak. In addition, we show that the non-parabolic confinement leads to novel confinement-induced resonances. Furthermore, we include weak disorder and study one-dimensional bosons with strong repulsive interactions. In analogy to the clean Tonks-Girardeau gas, a Bose-Fermi mapping expresses this problem in terms of disordered non-interacting fermions. Thereby many known exact results apply. We also analyze the so-far unknown bosonic momentum distribution, and comment on the experimental observability of these predictions in ultracold atomic gases.