Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 2: Quantum Gases: Bosons 1

Q 2.7: Vortrag

Montag, 14. März 2011, 12:00–12:15, HÜL 386

Probing carbon nanotube with cold gases — •Mathias Schneider and Reinhold Walser — Institut für Angewandte Physik, TU Darmstadt

The interaction of carbon nanotubes with cold gases has many unknowns. In particular, the interaction potentials and loss rates are under intense investigations (cf Casimir-Polder potential). In this contribution we would like to ask the inverse question and obtain potential shapes from observed loss rates.

In the case of Bose condensed gases we use superfluid hydrodynamics in a perturbative limit (linear response) to calculate the particle loss rate for certain potential shapes. This model incorporates two basic features. First, the nanotube attracts atoms nearby through a very short ranged attractive potential. Second, inelastic collisions between the nanotube and condensed atoms surrounding it lead to particle loss. Quantities of interest are the density profile of the condensate, the evolution of the ground state occupation number and how these are connected to basic parameters like two body interaction strength, the atom-object collision rate, etc.