Quantum Accelerator Modes in BEC

Vijayashankar Ramareddy, G. Behinaein, Ishan Talukdar +2 more

We report the observation of high order resonances of the quantum $δ$-kicked accelerator using a BEC kicked by a standing wave of light. The signature of these resonances is the existence of quantum accelerator modes. For the first time quantum accelerator modes were seen near 1/4 and 1/3 of the Talbot time. Using a BEC enabled us to study the detailed structure of the modes and resonances which are related to the fractional Talbot effect. We present a general theory for this system and apply it to predict the behavior of the accelerator modes.

Alessandro Zenesini, Donatella Ciampini, D. Cossart +4 more

José Tito Mendonça, Hugo Terças

Vijayashankar Ramareddy, G. Behinaein, Ishan Talukdar +2 more

We report the observation of high-order resonances of the quantum δ-kicked accelerator using a BEC kicked by a standing wave of light. The signature of these resonances is the existence of quantum accelerator modes. For the first time quantum accelerator modes were seen near 1/2, 2/3 and 1/3 of the half-Talbot time. Using a BEC enabled the internal momentum state structure of the modes and resonances to be studied for the first time. This structure has many similarities to that present in the fractional Talbot effect. We present a theory for this system based on rephasing of momentum orders and apply it to predict the behavior of the accelerator modes around a resonance of any order.

Christoph Ira Westbrook

Ghazal Behin Aein

Scope and Method of Study: The purpose of this research was to experimentally study a quantum delta-kicked accelerator utilizing a Bose Einstein condensate (BEC) of Rb87 atoms. An all optical method was chosen to create a BEC. Generalization of the quantum theory of the quantum accelerator modes to include the higher order QAM's observed in cold atomic systems was also among the topics studied in this research.