J4 ›› 2014, Vol. 31 ›› Issue (5): 576-582.

• Quantum Optics • Previous Articles     Next Articles

Anderson localization of Bose-condensed gas in disordered speckle potentials

CHEN Chuan-shu,XU Zhi-jun   

  1. Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China
  • Received:2014-01-20 Revised:2014-08-18 Published:2014-09-28 Online:2014-09-17

Abstract: Based on the Gross-Pitaevskii (G-P) energy functional, the Anderson localization of a weakly-interacting Bose-condensed gas in a controllable speckle potential was investigated by means of split-step Fourier spectral method. The conclusions are as following. (1) The Gaussian-like exponential ansatz achieves good results in variation analysis. (2) Under the condition that disorder strength η is 1, interaction between atoms κ is 0.1 and characteristic intensity of speckle potential Vs is greater than 0.6 times of chemical potential μ, Bose-condensed gas can maintain a stable localized state during evolution. (3) The larger interaction between atoms goes against the formation of a stable Anderson localization when κ is greater than 5. (4) Under the condition that Vs is 0.6μ and κ is 0.1, Anderson localization of Bose-condensed gas is more notable as the disorder strength of speckle potential η increases.

Key words: quantum optics; Anderson localization; Gross-Pitaevskii equation; speckle potentials; Bose-condensed gas