Eur. Phys. J. B (2012) 85: 188
https://doi.org/10.1140/epjb/e2012-20990-8

Regular Article

Achieving high molecular conversion efficiency via a magnetic field pulse train

¹ School of Physics, Beijing Institute of Technology, Beijing 100081, P.R. China
² Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, P.R. China
³ Key Laboratory of High Energy Density Physics Simulation, Center for Applied Physics and Technology, Peking University, Beijing 100084, P.R. China
⁴ Science and Technology Computation Physics Laboratory, Institute of Applied Physics and Computational Mathematics, Beijing 100088, P.R. China

^a e-mail: doufq@nwnu.edu.cn

Received: 6 December 2011
Received in final form: 24 February 2012
Published online: 6 June 2012

Abstract

We investigate the process of production of ultracold molecules in an ultracold bosonic system with particle interaction via designing a magnetic field pulse train near a Feshbach resonance. This technique offers a high conversion efficiency up to 100% by tuning the pulse durations appropriately. The molecular conversion efficiency is related to the duration of each pulse, which can be derived analytically. It is found that the conversion efficiency is insensitive to the first pulse, highly sensitive to the second one, and very insensitive to the third one. The effects of particle interaction on conversion process are discussed as well.