Make slow fast —How to speed up interacting disordered matter

¹ Max Planck Institute for the Physics of Complex Systems - Nöthnitzer Straße 38, 01187, Dresden, Germany, EU
² Vinča Institute of Nuclear Sciences, University of Belgrade - P.O. Box 522, 11001 Belgrade, Serbia
³ New Zealand Institute for Advanced Study, Massey University - Auckland, New Zealand

Received: 29 November 2012
Accepted: 2 January 2013

Abstract

Anderson and dynamical localization have been experimentally observed with ultra-cold atomic matter. Feshbach resonances are used to efficiently control the strength of interactions between atoms. This allows to study the delocalization effect of interactions for localized wave packets. The delocalization processes are subdiffusive and slow, thereby limiting the quantitative experimental and numerical analysis. We propose an elegant solution of the problem by proper ramping the interaction strength in time. We demonstrate that subdiffusion is speeded up to normal diffusion for interacting disordered and kicked atomic systems. The door is open to test these theoretical results experimentally, and to attack similar computational quests in higher space dimensions