Publications [#232548] of Martin Fischer

Journal Articles
  1. Madison, KW; Fischer, MC; Raizen, MG, Observation of the Wannier-Stark fan and the fractional ladder in an accelerating optical lattice, Physical Review A - Atomic, Molecular, and Optical Physics, vol. 60 no. 3 (1999), pp. R1767-R1770 .

    We report an experimental study of the Wannier-Stark fan and the fractional Wannier-Stark ladder using laser-cooled sodium atoms in an accelerating one-dimensional standing wave of light. We prepare the atoms in the lowest motional band of the optical lattice and then impose a constant acceleration. A weak oscillatory component is added to the acceleration in order to resonantly drive interband transitions, and the number of atoms that remain in the lowest band is measured as a function of the probe frequency. The spectrum is characterized by a ladder of resonances spaced by the atomic Bloch oscillation frequency ωB. When an additional, strong ac component at frequency Ωis added, a fractional ladder is observed with a spacing related to the electric matching ratio Ω/ωB. ©1999 The American Physical Society.