title: Asymmetric superradiant scattering and abnormal mode amplification induced by atomic density distortion.
abstract: The superradiant Rayleigh scattering using a pump laser incident along the short axis of a Bose-Einstein condensate with a density distortion is studied, where the distortion is formed by shocking the condensate utilizing the residual magnetic force after the switching-off of the trapping potential. We find that very small variation of the atomic density distribution would induce remarkable asymmetrically populated scattering modes by the matter-wave superradiance with long time pulse. The optical field in the diluter region of the atomic cloud is more greatly amplified, which is not an ordinary mode amplification with the previous cognition. Our numerical simulations with the density envelop distortion are consistent with the experimental results. This supplies a useful method to reflect the geometric symmetries of the atomic density profile by the superradiance scattering.
authors.affiliation: School of Electronics Engineering & Computer Science, Peking University, Beijing 100871, China.
authors.forename: Zhongkai
authors.initials: Z
authors.lastname: Wang
authors.forename: Linxiao
authors.initials: L
authors.lastname: Niu
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.forename: Mingxuan
authors.initials: M
authors.lastname: Wen
authors.forename: Zhen
authors.initials: Z
authors.lastname: Fang
authors.forename: Xuzong
authors.initials: X
authors.lastname: Chen
authors.forename: Xiaoji
authors.initials: X
authors.lastname: Zhou
mesh_terms: D000669:Amplifiers, Electronic; D003198:Computer Simulation; D007834:Lasers; D008027:Light; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation