We study the decoherence of superradiant Rayleigh scattering from condensed atoms without confinement,by using two same pumping pulses with an interval time.The first pulse is to establish a matter-wave grating,and th...We study the decoherence of superradiant Rayleigh scattering from condensed atoms without confinement,by using two same pumping pulses with an interval time.The first pulse is to establish a matter-wave grating,and the coherence between different momentum modes is measured by the second pulse after a variable interval time.Different from the case in the trap,the distruction of the grating owing to the phase perturbation is very fast,and the superradiant process is inhibited very soon afterwards for released atoms.A semi-classical model is applied to simulate this phase perturbation,and the calculation agrees with our experimental results.展开更多
基金Supported by the National Basic Research Program of China under Grant No 2011CB921501the National Natural Science Foundation of China under Grant Nos 61027016,61078026 and 10934010.
文摘We study the decoherence of superradiant Rayleigh scattering from condensed atoms without confinement,by using two same pumping pulses with an interval time.The first pulse is to establish a matter-wave grating,and the coherence between different momentum modes is measured by the second pulse after a variable interval time.Different from the case in the trap,the distruction of the grating owing to the phase perturbation is very fast,and the superradiant process is inhibited very soon afterwards for released atoms.A semi-classical model is applied to simulate this phase perturbation,and the calculation agrees with our experimental results.
