Super-interference in atomic photoionization: Moire patterns in momentum maps

We theoretically investigate on the origin of lateral ring structures in the doubly differential momentum distribution for atomic ionization by laser pulses in the midinfrared spectral region. We demonstrate that such structures stems from the interplay between intra- and intercycle interference patterns which work as two separate grids in the two-dimensional momentum domain When the periods of the two grids (intra- and intercycle) are similar, moire patterns arise as concentric rings at high electron kinetic energy.