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Q: Quantenoptik und Photonik

Q 14: Quantengase III

Q 14.3: Vortrag

Montag, 13. März 2006, 17:30–17:45, HVI

Magnetic coupling of a BEC to a nano-mechanical resonator — •David Hunger¹, Philipp Treutlein¹, Stefan Camerer², Daniel König², Jörg Kotthaus², Theodor W. Hänsch¹, and Jakob Reichel³ — ¹Max-Planck-Institut für Quantenoptik und Department für Physik der Ludwig-Maximilians-Universität München, Germany — ²Department für Physik der Ludwig-Maximilians-Universität München, Germany — ³Laboratoire Kastler Brossel de l’ENS, Paris, France

Atom chips are a well suited toolbox for a new, promising research field: The combination of quantum optics and condensed-matter systems. A first milestone in this direction is to show that a designed, controllable interaction between atoms and nano-structured solid state systems can be established and measured.
We are currently setting up an experiment to couple the thermally induced oscillation of a nano-mechanical beam resonator to a nearby Bose-Einstein condensate via a magnetic interaction. A small island of ferromagnetic material at the center of the beam causes a magnetic dipole field with an oscillating contribution. At the position of the atoms the field oscillation can cause observable trap loss if it is resonant with atomic spin-flip transitions to untrapped magnetic sublevels. Sweeping the static field of the trap and with it the spin-flip resonance reveals the frequency spectrum of the beam.
The experiment provides a new method to measure the room temperature spectrum of nano-resonators, thereby demonstrating the controlled interaction with trapped atoms. Beyond this it allows to study the conditions for coherent coupling of such systems.