PHYSICAL REVIEW LETTERS week ending PRL101,250401(2008) 19 DECEMBER 2008 Matter-Wave Self-Imaging by Atomic Center-of- Mass Motion Induced Interference Ke Li. L. Deng. E W Hagley. M G. Payne, 'and M.S. Zhan2-3 1 order t order (Ak1,2 3 order 0:0 0 -2md orde 2nc order 0 ..:0 0音0 Collapse of multiple diffraction orders Recurrence of multiple diffraction orders n-2) 100%(= 0);。g Intensity difference of the two beams matters 1=1+12+2L cos(2kx) The concept of widely accepted optical lattice cannot be applied!Intensity difference of the two beams matters! 1 2 1 2 I I I I I kx = + + 2 cos(2 ) The concept of Widely accepted optical lattice cannot be applied!