Observation of the Wannier-Stark fan and the fractional ladder in an accelerating optical lattice


Journal Article

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 [Formula Presented] When an additional, strong ac component at frequency [Formula Presented] is added, a fractional ladder is observed with a spacing related to the electric matching ratio [Formula Presented]. © 1999 The American Physical Society.

Full Text

Duke Authors

Cited Authors

  • Madison, KW; Fischer, MC; Raizen, MG

Published Date

  • January 1, 1999

Published In

Volume / Issue

  • 60 / 3

Start / End Page

  • R1767 - R1770

Electronic International Standard Serial Number (EISSN)

  • 1094-1622

International Standard Serial Number (ISSN)

  • 1050-2947

Digital Object Identifier (DOI)

  • 10.1103/PhysRevA.60.R1767

Citation Source

  • Scopus