Atomic momentum patterns with narrower interval

Abstract

We studied the atomic momentum distribution for a superposition of Bloch states spreading in the lowest band of an optical lattice after the action of the standing wave pulse. By designing the imposing pulse on this superposed state, an atomic momentum pattern appears with narrower interval between the adjacent peaks that can be far less than the double recoil momentum. The patterns with narrower interval come from the superposition of the action of the designed pulse on many Bloch states with quasi-momenta over the first Brillouin zone, where for each quasi-momentum there is an interference among several lowest bands. Our experimental result of narrow interval peaks is consistent with the theoretical simulation. The patterns of multi modes with different quasi-momenta are helpful for precise measurement and atomic manipulation.

6 pages, 5 figures

References in corpus (8)

• Many-Body Physics with Ultracold Gases
• Atom Interferometers
• State preparation and dynamics of ultracold atoms in higher lattice orbitals
• Atom-wave diffraction between the Raman-Nath and the Bragg regime: Effective Rabi frequency, losses, and phase shifts
• Momentum-space engineering of gaseous Bose-Einstein condensates
• Excitation of atoms in an optical lattice driven by polychromatic amplitude modulation
• The theory of quantum levitators
• Phases of d-orbital bosons in optical lattices