Berlin 2005 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 36: Quanteneffekte II

Q 36.3: Vortrag

Dienstag, 8. März 2005, 11:15–11:30, HU 1072

The Quantum Ulm Sparrow — •O. Crasser¹, C. Feiler¹, A. Wolf¹, V. Pokrovsky^2,3, G. Süßmann⁴, and W. P. Schleich¹ — ¹Abteilung für Quantenphysik, Universität Ulm, 89069 Ulm, Germany — ²Department of Physics, Texas A&M University, College Station, Texas, USA — ³Landau Institute for Theoretical Physics, Chernogolovka, Moscow District, 142432, Russia — ⁴Ludwig-Maximilians-Universität München, Sektion Physik, 85748 Garching, Germany

We consider the scattering of a rotor from a slit which is smaller than the length of the rotor. This scattering situation is reminiscence of the Ulm sparrow trying to fly into its nest with a straw in its beak. The quantum state of rotation is an s-state. We show that in the limit of the kinetic energy being smaller than the energy of the first excited rotational state the transmission probability is exponentially small. Indeed, the rotor feels the wall and has to battle against an effective potential induced by the restriction in the rotation. Hence, tunneling is the only way for the rotor to overcome the barrier. We discuss experimental realizations of the Quantum Ulm Sparrow.