Collective Excitations of a Trapped Bose-Einstein Condensate in the Presence of a 1D Optical Lattice

Year: 2003

Authors: Fort C., Cataliotti F.S., Fallani L., Ferlaino F., Maddaloni P., Inguscio M.

Autors Affiliation: LENS, Dipartimento di Fisica, Universita` di Firenze and Istituto Nazionale per la Fisica della Materia, via Nello Carrara 1, I-50019 Sesto Fiorentino (Firenze), Italy; Dipartimento di Fisica Universita` di Catania, via S. Sofia 64, I-95124 Catania, Italy

Abstract: We study low-lying collective modes of an elongated Rb-87 condensate produced in a 3D magnetic harmonic trap with the addition of a 1D periodic potential which is provided by a laser standing wave along the axial direction. While the transverse breathing mode remains unperturbed, quadrupole and dipole oscillations along the optical lattice are strongly modified. Precise measurements of the collective mode frequencies at different heights of the optical barriers provide a stringent test of the theoretical model recently introduced [M. Kramer et al., Phys. Rev. Lett. 88, 180404 (2002)].

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 90 (14)      Pages from: 140405-1  to: 140405-4

More Information: We acknowledge S. Stringari, M. Krämer, and ?>M. Modugno for fruitful discussions, theoretical contribution, and the critical reading of the manuscript. This work has been supported by the EU under Contracts No. HPRI-CT 1999-00111 and No. HPRN-CT-2000-00125, by the MURST through the PRIN 1999 and PRIN 2000 Initiatives and by the INFM Progetto di Ricerca Avanzata “Photon Matter.”
KeyWords: Hole traps; Josephson junction devices; Laser beams; Mathematical models; Partial differential equations; Quantum optics; Rubidium; Superfluid helium; Bose-Einstein condensates; Hydrodynamic equation; Magnetic trap; Optical lattices; Quantum theory
DOI: 10.1103/PhysRevLett.90.140405

Citations: 55
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