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An improved quantum trajectory Monte Carlo method involving the Stark shiftof the initial state, Coulomb potential, and multielectron polarization-induceddipole potential is used to revisit the origin of the low-energy interferencestructure in the photoelectron momentum distribution of the xenon atomsubjected to an intense laser field, and resolve the different contributions ofthese three effects. In addition to the well-studied radial finger-likeinterference structure, a ring-like interference structure induced byinterference among electron wave packets emitted from multi-cycle time windowsof the laser field is found in the low energy part of the photoelectronmomentum spectrum. It is attributed to the combined effect of the Coulombpotential and Stark shift. Our finding provides new insight into the imaging ofelectron dynamics of atoms and molecules with intense laser fields.

Effect of Stark shift on low-energy interference structure in strong-field ionization