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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects

Q 30.85: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Excitation and tunneling in the harmonic and anharmonic limit of the Morse potential — •Harald Losert, Karl Vogel, and Wolfgang P. Schleich — Institut für Quantenphysik, Universität Ulm, D-89069 Ulm, Germany

We study the behavior of a particle in the Morse potential under the influence of external fields. We haven chosen this model system since the eigenvalues, eigenfunctions and dipole matrix elements can be calculated analytically. Moreover, the tunability of the spacing of the energy levels opens up the transition from the harmonic to the anharmonic limit. Hence, this model system allows an analytical as well as an efficient numerical investigation of a variety of problems.

In particular, we apply an oscillating external field and study the excitation of eigenstates and wave packets in the anharmonic and close-to-harmonic case. Furthermore, a constant external field tilts the Morse potential and enables quantum tunneling. We compare and interpret the tunneling processes of various states in such a metastable potential.