Dresden 2017 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 15: Quantum Dynamics, Decoherence, Quantum Information
DY 15.5: Vortrag
Dienstag, 21. März 2017, 10:30–10:45, ZEU 160
Long-lived resonances at mirrors — •Friedemann Queisser1 and William Unruh2 — 1Fakultät für Physik, Universität Duisburg-Essen, Lotharstraße, Duisburg 47048, Germany — 2Department of Physics, University of British Columbia, Vancouver, V6T 1Z1 Canada
Motivated by realistic scattering processes of composite systems, we study the dynamics of a two-particle bound system which is scattered at a mirror [1]. We consider two different scenarios: In the first case we assume that only one particle interacts directly with the mirror whereas in the second case both particles are scattered. The coherence between the transmitted and the reflected wave-packet is reduced when the internal degree of freedom (the relative coordinate) of the bound system becomes excited. If both particles interact with the mirror, it is possible that the composite system is trapped at the mirror for a finite time. These long-lived resonances occur although the interaction of the bound system with the mirror is purely repulsive.
The findings should be of relevance for the state preparation of mesoscopic objects and for double-slit experiments with composite systems.
[1] F. Queisser and W. G. Unruh, arXiv:1503.08814