title: Coherent delocalization of atomic wave packets in driven lattice potentials.
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.
authors: Dipartimento di Fisica and LENS-Università di Firenze, CNR-INFM, INFN-Sezione di Firenze, via Sansone 1, 50019 Sesto Fiorentino, Italy.
authors: V V
authors: VV
authors: Ivanov
authors: A
authors: A
authors: Alberti
authors: M
authors: M
authors: Schioppo
authors: G
authors: G
authors: Ferrari
authors: M
authors: M
authors: Artoni
authors: M L
authors: ML
authors: Chiofalo
authors: G M
authors: GM
authors: Tino