Atoms in an amplitude-modulated standing wave - dynamics and pathways to quantum chaos

Cold rubidium atoms are subjected to an amplitude-modulated far-detuned sta nding wave of light to form a quantum-driven pendulum. Here we discuss the dynamics of these atoms. Phase space resonances and chaotic transients of t he system exhibit dynamics which can be useful in many atom optics applicat ions as they can be utilized as means for phase space state preparation. We explain the occurrence of distinct peaks in the atomic momentum distributi on, analyse them in detail and give evidence for the importance of the syst em for quantum chaos and decoherence studies.