Controlling dynamical localization by waveform reshapingR. Chacón1, F. Borondo2 and D. Farrelly2
1 Departamento de Física Aplicada, Escuela de Ingenierías Industriales, Universidad de Extremadura Apartado Postal 382, E-06071 Badajoz, Spain, EU
2 Departamento de Química and Instituto Mixto de Matemáticas CSIC-UAM-UC3M-UCM, Universidad Autónoma de Madrid - Cantoblanco, E-28049 Madrid, Spain, EU
received 27 January 2009; accepted in final form 16 April 2009; published May 2009
published online 13 May 2009
We show that reliable control of dynamical localization (DL) in the context of generic Hamiltonians subjected to periodic fields can be achieved by solely reshaping the field waveform. This approach is discussed using an example of cold atoms moving in a phase-modulated standing light field. We explain the control mechanism on the basis of a correlation between the strength of DL and the chaotic layer width of a perturbed pendulum that effectively describes the atoms' dynamics. In particular, this approach provides a versatile mechanism for controlling the dynamics of cold atoms which is capable of experimental realization in a near future.
05.45.Mt - Quantum chaos; semiclassical methods.
42.50.Wk - Mechanical effects of light on material media, microstructures and particles.
© EPLA 2009