Coherent delocalization of atomic wave packets in driven lattice potentials

Year: 2008

Authors: Ivanov V. V., Alberti A., Schioppo M., Ferrari G., Artoni M., Chiofalo M.L., Tino G.M.

Autors Affiliation: Dipartimento di Fisica and LENS-Universita` di Firenze, CNR-INFM, INFN-Sezione di Firenze, via Sansone 1, 50019 Sesto Fiorentino, Italy; Department of Chemistry and Physics of Materials-University of Brescia, and LENS, Italy; INFN and Department of Mathematics, Faculty of Pharmacy, University of Pisa, Pisa, Italy

Abstract: Atomic wave packets loaded into a phase-modulated vertical optical-lattice potential exhibit a coherent delocalization dynamics arising from intraband transitions among Wannier-Stark levels. Wannier-Stark intraband transitions are here observed by monitoring the in situ wave-packet extent. By varying the modulation frequency, we find resonances at integer multiples of the Bloch frequency. The resonances show a Fourier-limited width for interrogation times up to 2 s. This can also be used to determine the gravity acceleration with ppm resolution.


Volume: 100 (4)      Pages from: 043602  to: 043602

KeyWords: transport phenomena in lattices; optical lattices; matter waves
DOI: 10.1103/PhysRevLett.100.043602

Citations: 85
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