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A: Fachverband Atomphysik

A 29: Poster: Ultra-cold atoms, ions and BEC (with Q)

A 29.25: Poster

Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof

Evidence for a quantum-to-classical transition in a system of two coupled quantum rotors — •Bryce Gadway^1,2, Jeremy Reeves¹, Ludwig Krinner¹, and Dominik Schneble¹ — ¹Dept. of Physics and Astronomy, Stony Brook University, Stony Brook, NY, USA — ²present address: JILA, University of Colorado, Boulder, CO, USA

We experimentally realize a pair of two coupled quantum kicked rotors, by subjecting a coherent atomic matter wave to two periodically pulsed, incommensurate optical lattices. Momentum transport in this system is found to be radically different from the well-known behavior of a single kicked rotor, with a breakdown of dynamical localization and the emergence of classical diffusion. Our observations confirm a long-standing prediction for many-dimensional quantum-chaotic systems, and shed new light on how classical behavior can emerge in isolated, periodically driven quantum systems.